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 Evolution of threats in Dark Web and Surface Web forums: a study based on topic modeling and time series. In <em>Proceedings of the 25th Brazilian Symposium on Cybersecurity</em>, September 01, 2025, Foz do Iguaçu/PR, Brasil. SBC, Porto Alegre, Brasil, 401-416. DOI: <a href="https://doi.org/10.5753/sbseg.2025.11375">https://doi.org/10.5753/sbseg.2025.11375</a>.