Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbbcfc1cefc4b6f…

MALICIOUS

PDF

81.8 KB Created: 2021-04-29 07:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8f550b91f7a47f531d7c009846f792f2 SHA-1: aaa1d59632f661a0a231281c3d87f48357b3551a SHA-256: 8cbbcfc1cefc4b6f615c53a9cbabf8183189e55d226a6bae7c3b55cc4c6761df
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, identified as a link farm, with several pointing to disposable domains. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to manipulate search results or redirect users to potentially harmful sites. While no scripts were directly extracted, the presence of external links and the ML classifier's high confidence score suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/strik?utm_term=the+5+stages+of+relationships+everyone+should+know PDF link annotation
    • http://segway-wheelchair.ru/download_game_minecraft_pokemon_go_mod_apkhwv3r.pdfIn PDF document text
    • https://domazatavaxagit.weebly.com/uploads/1/3/0/7/130775902/5a1789fc68.pdfIn PDF document text
    • http://frasqen.online/zunosekc0hi8.pdfIn PDF document text
    • http://amorexpo.com/hungry_shark_world_para_pcbch3f.pdfIn PDF document text
    • https://kojaxinepizoju.weebly.com/uploads/1/3/1/8/131856409/jadiwawogasej-vatidijinozoj-wenagobe.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/gukevometosan-dadiraj-xajenujuso.pdfIn PDF document text
    • http://burrrhey.tech/dipokudiw7r3zu.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/tepapipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_238c7c278dcc4b3da995f2b71fde8223.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b129dc-1391-4f3b-a528-a84cbfd0697e/why_does_my_directv_remote_flash_green.pdfIn PDF document text
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_add4c326e5a849e585c7988a320bab8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18eb4008-ddd3-4c82-9058-53cbda22452b/luzatozawamazari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbd1749-be40-42b4-a1fb-c3295a948514/tuwuxataradasojim.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_a8c88f6fbe7c4e148470b862744594ef.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_bafd62a85f0e4169849dfa4b95361f7e.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_48957f8142b74e12b2b33c396acdad8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e840380d-6996-4b62-8be7-a6fef0d47d92/sigmund_freud_theory_of_personality_development.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_e16efdc5673a4fd5aa45071077a3b8fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11be1535-7c40-4636-aa07-6d89e204d203/sony_fs700_slow_motion_specs.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_f275865724074a3a8750089541cf6df0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8960b734-3bc4-4a6b-b58b-00acd722a175/ergo_omni_weight_limit.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_ee2fae6debbf4b06b7283e21b3f28d44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af060216-cce9-45a6-818d-0fa747729289/50451025139.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 5696 bytes
SHA-256: 0b5b2d6f4dc0e0919d9a86217ba515c9ae81af8423772979273046dc38a10177
font_01_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 10496 bytes
SHA-256: c6588d5430bfd3f5b260a9547ddc767bb8006d809a87fc1cca39f29b0b216775
font_02_sfnt_off00013000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13000 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19

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