/usr/lib/ruby/vendor_ruby/ is in ruby-open-graph-reader 0.6.1~dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/open_graph_reader/
/usr/lib/ruby/vendor_ruby/open_graph_reader/fetcher.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/object/
/usr/lib/ruby/vendor_ruby/open_graph_reader/object/registry.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/object/dsl.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/object/dsl/
/usr/lib/ruby/vendor_ruby/open_graph_reader/object/dsl/types.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/configuration.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/base.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/object.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/builder.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/definitions.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/parser.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/version.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader/parser/
/usr/lib/ruby/vendor_ruby/open_graph_reader/parser/graph.rb
/usr/lib/ruby/vendor_ruby/open_graph_reader.rb