Looking at your sample with a hex browser, the beginning of the file contains 192K or random data. In particular I cannot find what looks like a proper Jpeg file header.

The beginning of your file:

The beginning of a JPEG from my Canon camera, showing proper FFD8 Jpeg marker and recognizable Exif data (camera model, time):

After the 192K or random data, the file contents are 1.3MB of null bytes.

The size of the file itself (1.6MB) is much smaller than the usual out of camera JPEG if you choose the high quality JPEG (4MB on my very old 12Mpix camera, 7MB on my not-so-recent 20Mpix camera) and this alone should make you suspicious. In addition if you try to compress the file (make a ZIP from it), it compresses very well (down to 300K) when real JPEG are nearly uncompressible.

So, in short, your file is totally corrupted and there is nothing you can get out of it.

Why it is so is another question, if you cannot see the pictures in the camera playback or if you transferred the file to your PC using a card reader this is probably a SD card malfunction, with not much hop to recover anything. If the images can still be seen in the camera playback then it could be a transfer problem but you will have to tell us exactly how you did the transfer (USB cable? Wifi? Card reader?).