Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdccaadc097e9d51…

MALICIOUS

PDF

87.8 KB Created: 2021-03-24 23:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 825c33cbfbc443c5c59fcea169d083a8 SHA-1: e9ecea6fa41f43b8113842fd49c3b5ec9ebd1b4f SHA-256: cdccaadc097e9d51d82efa7192aa2d53695a5614472a8639b480a0f9a96fb05e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://zajinet.ru/wix?keyword=law+and+order+svu+scorched+earth+dailymotion, which is likely part of the malicious infrastructure. No scripts were extracted, but the presence of numerous external links points towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=law+and+order+svu+scorched+earth+dailymotion
    • http://mapenibo.scienceontheweb.net/janizimokufakijufinet.pdf
    • https://cdn-cms.f-static.net/uploads/4387033/normal_603b3e84f2215.pdf
    • http://vijofudevadotar.mywebcommunity.org/character_vocabulary_exercises.pdf
    • https://cdn-cms.f-static.net/uploads/4503279/normal_5fe8217080f47.pdf
    • https://cdn-cms.f-static.net/uploads/4417405/normal_603d258e32520.pdf
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6036da6eba2ce.pdf
    • http://kitafoged.medianewsonline.com/english_conversation_book_free.pdf
    • http://nuxuzuruguli.mypressonline.com/manual_de_primeros_auxilios_cruz_roja_colombiana.pdf
    • https://static.s123-cdn-static.com/uploads/4454051/normal_5fdfc3ee2af52.pdf
    • https://cdn-cms.f-static.net/uploads/4393183/normal_600d6d101e072.pdf
    • https://static.s123-cdn-static.com/uploads/4417644/normal_5ffe6fd0917f9.pdf
    • http://zuduwamani.mypressonline.com/nepawukaxomezetodewasen.pdf
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fede03889824.pdf
    • https://cdn-cms.f-static.net/uploads/4381737/normal_602cac759baf9.pdf
    • http://dokakepitizix.medianewsonline.com/star_wars_incredible_cross_sections_attack_of_the_clones.pdf
    • http://salimom.mygamesonline.org/hindu_religious_books_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4486356/normal_6007fe4526dd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gubadif.myartsonline.com/best_wireless_communication_standard.pdf
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_023b3c92343148978bd0bf55c2b36541.pdf?index=true
    • http://mixezized.myartsonline.com/14203893171.pdf
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_06e6a046b0f8437cb8ca73659a353d4a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d5.bin
788edf8daefa6de7e0bc632883ca48c09290072fabb7004b59fd81e1f7d780e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 5372 bytes
font_01_sfnt_off0001060d.bin
a6c6d53378da330912be0b2593624718bbe95569b510397c70e13acdfe5edef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 4236 bytes
font_02_sfnt_off0001116f.bin
8211254df371e7b9df340bb6f963083f18bb54919a624f37dd4c237846dd634d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 11832 bytes
font_03_sfnt_off000139c6.bin
961336d18da024619d8853f93e85b5c084237a8f60d69b3631bd3875eae0e3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139C6 16752 bytes

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