/usr/lib/x86_64-linux-gnu/libdar64.so is in libdar-dev 2.5.3-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libdar64.so.5000.7.3
/usr/lib/x86_64-linux-gnu/libdar64.so.5000.7.3