/usr/share/ibus-mozc/tool.png is in ibus-mozc 1.15.1857.102-1+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/ibus-mozc/../icons/mozc/ui-tool.png
/usr/share/ibus-mozc/../icons/mozc/ui-tool.png