/usr/lib/x86_64-linux-gnu/libobrender.so is in openbox-dev 3.5.2-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libobrender.so.29.0.1
/usr/lib/x86_64-linux-gnu/libobrender.so.29.0.1