/usr/lib/x86_64-linux-gnu/libIceStorm.so.35 is in libicestorm35v5 3.5.1-6.4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libIceStorm.so.3.5.1
/usr/lib/x86_64-linux-gnu/libIceStorm.so.3.5.1