/usr/lib/x86_64-linux-gnu/libsdformat.so is in libsdformat6-dev 6.0.0+dfsg-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsdformat.so.6
/usr/lib/x86_64-linux-gnu/libsdformat.so.6