Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2130e21b3d383fd…

MALICIOUS

PDF

73.4 KB Created: 2021-03-15 01:34:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89d4cef70be4e34a58b0efdbc4dc3bff SHA-1: 2b1beaf162d41e7c863822982ce4995953f66179 SHA-256: a2130e21b3d383fd61aae1be165891a9a2d91259c7e3d7fbf1bac4cfe41a79ca
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, and at least one URL is associated with phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest a phishing or SEO-based malicious content delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

Heuristics 4

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://midufefew.ru/award?keyword=modelo+biopsicosocial+en+salud+pdf
    • http://ruwaxidalemib.iblogger.org/convert_base64_to_blob_javascript.pdf
    • http://suzaxikuzexaw.66ghz.com/48898136507.pdf
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5fe8919be8f2c.pdf
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/pogoxo-rivikupezowatu-kegube-suniwuta.pdf
    • https://cdn-cms.f-static.net/uploads/4404727/normal_60492453d4f48.pdf
    • https://cdn.sqhk.co/rotefuver/ajajdha/35405885829.pdf
    • https://jotovaxawunujej.weebly.com/uploads/1/3/1/8/131856347/guvidep.pdf
    • https://cdn.sqhk.co/tabuguran/DijGFjh/10611101439.pdf
    • http://tipowozit.iblogger.org/air_conditioning_and_refrigeration_miller.pdf
    • https://cdn.sqhk.co/veletafi/2ggMyEU/lebefodu.pdf
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/fc67b7d420.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_42747030a36e44c48f5cf7ccf8989fed.pdf?index=true
    • http://fusupufe.epizy.com/xijuwaxuti.pdf
    • http://nitesegu.epizy.com/75039168264.pdf
    • http://jepameji.rf.gd/gedorogorip.pdf
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_7b24e740fab54ba7ae5b141444c8dcb6.pdf?index=true
    • http://ruvibeli.rf.gd/blood_money_chaahat_song.pdf
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_b434d90ec6914c9db2b00234a0732991.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_7a0d53a3d20f47c58a2ac09c908367c7.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec7.bin
cf2ad88401fdcfa6b596d83dd3077a5beaa9460303348d5562c38f8ef413b56e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 5200 bytes
font_01_sfnt_off00010094.bin
514a9b23d167f77eb9c3cec78096c24fe57ba5c97d25ae48126e51e5bdced6b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 11844 bytes

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