If you're wondering whether sso.kinopoisk.ru is a scam, the short answer is no — but it's not functioning either. This subdomain is part of kinopoisk.ru, a well-known Russian movie database owned by Yandex. That parent site is legitimate, widely used, and has a long track record. The problem here is that this particular URL returns a 404 error. It doesn't serve any content, so it can't be used for logging in or anything else.
For comparison, a properly running SSO endpoint from a major service would load a login page, have a valid certificate, and usually redirect to a main authentication portal. Here, the missing page suggests the subdomain may be deprecated or misconfigured.
If you're trying to reach kinopoisk's login, go directly to kinopoisk.ru rather than using this subdomain. Until sso.kinopoisk.ru comes back online, there's no reason to interact with it. The evidence doesn't support calling it fake or a scam — it's simply not live.