/etc/xdg/kickoffrc is in kubuntu-settings-desktop 1:18.04ubuntu11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Homepage=http://www.kubuntu.org/
[Favorites]
FavoriteURLs=preferred://browser,org.kde.discover.desktop,org.kde.kontact.desktop,org.kde.kate.desktop,libreoffice-startcenter.desktop,org.kde.dolphin.desktop,org.kde.ksysguard.desktop,systemsettings.desktop,org.kde.konsole.desktop
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