/usr/share/ is in ruby-rails-assets-favico.js 0.3.9~dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/ruby-rails-assets-favico.js/
/usr/share/doc/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/rails-assets-favico.js-0.3.9.gemspec
/usr/share/ruby-rails-assets-favico.js/
/usr/share/ruby-rails-assets-favico.js/app/
/usr/share/ruby-rails-assets-favico.js/app/assets/
/usr/share/ruby-rails-assets-favico.js/app/assets/javascripts/
/usr/share/ruby-rails-assets-favico.js/app/assets/javascripts/favico.js.js
/usr/share/ruby-rails-assets-favico.js/app/assets/javascripts/favico.js/
/usr/share/doc/ruby-rails-assets-favico.js/copyright
/usr/share/doc/ruby-rails-assets-favico.js/README.md
/usr/share/ruby-rails-assets-favico.js/app/assets/javascripts/favico.js/favico.js
/usr/share/ruby-rails-assets-favico.js/app/assets/javascripts/favico.js/favico-0.3.9.min.js
/usr/share/doc/ruby-rails-assets-favico.js/changelog.Debian.gz