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This is vignetting +

This is vignetting + distorsion.

LibRaw does not have internal lens database, so no way to correct this

here is RAW rendering: https://www.dropbox.com/s/oh4qoxuoiphj87v/Screenshot%202017-12-27%2010.4...
And embedded JPEG: https://www.dropbox.com/s/9zfo4sba6m9bvbf/Screenshot%202017-12-27%2010.4...

You may try to use Lensfun, most of Canon fixed-camera lenses listed as 'supported': http://lensfun.sourceforge.net/lenslist/

-- Alex Tutubalin