Font styles are not working properly in java using PDFBox while converting PDF to Image

Question

I'm using PDFBox for converting pdf to image. Here I'm facing an issue with font. while converting pdf to image I could see the below warnings in my log

Using fallback font LiberationSans for Helvetica-Bold
Using fallback font LiberationSans for Helvetica
Using fallback font LiberationSans for base font Courier-Bold
Using fallback font LiberationSans for base font Courier

because of this issue the font styles are not working properly. In PDF I have set the Bold font but after converting it into image its not showing as Bold font.

But the same code is working in my local machine which is Windows and not working server environments (application is running in Docker container, which is centos rhel fedora).

Please find the below code which I'm using

boolean isDoubleSide =false; //this is method parameter
try (PDDocument pdDocument = Loader.loadPDF(new File("path/to/pdffile"))) {
    PDFRenderer pdfRenderer = new PDFRenderer(pdDocument);
    for (int page = 0; page < pdDocument.getNumberOfPages(); ++page) {
        //Setting DPI as 203 for the image
        BufferedImage bufferedImage = pdfRenderer.renderImageWithDPI(page, 203);
        String imageFileName = (isDoubleSide ? Paths.get("path/to/imagefile", random_str + "_" + (page + 1) + ".jpeg").toString() :
                Paths.get("path/to/imagefile", sOutFileNameBase + ".jpeg").toString());
        ImageIO.write(bufferedImage, "jpeg", new File(imageFileName));
    }
}

I'm using latest pdfbox version - 3.0.1

Attaching the PDF and Image for the reference

This is PDF screenshot

This is converted Image

you can see the font is not properly displaying in Image. Please suggest some solution for this. Thanks.

Update

I have installed the fonts in the Container and tried that conversion, but still I could see the warnings in logs. In the below location that fonts are installed /usr/share/fonts/msttcorefonts/ Attaching the screen shot