Can dark ritual be countered with a counter spell?
It is a mana source so I believe it cannot be countered.
Dark RitualInstantAdd to your mana pool.
Mana Source (Obsolete) An obsolete card type. All cards printed with this card type are now instants. All abilities that, as printed, said a player could “play as a mana source” are now mana abilities. All relevant cards have been given errata in the Oracle card reference.
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I've never seen a Dark Ritual countered though. It's best to counter whatever they're using the mana to cast. Though I suppose someone might use it activate an ability, so there might be at least one situation you'd want to counter it.