Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aabb53a7f5ab6e…

MALICIOUS

PDF

78.7 KB Created: 2021-03-26 09:18:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc2743f6a7df8576a2bc74ae8ace64a5 SHA-1: d6006e76fb69d98879cc6edd17f6a8c3de99e4e7 SHA-256: a6aabb53a7f5ab6ea8791f5aff35fa232b3615b1ef4d8441a35832d880f7654a
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The presence of a large number of external links, including a link farm, suggests an attempt to obscure the malicious destination and potentially engage in SEO manipulation. The document body, though partially corrupted, contains references to a 'study guide' and 'wkhtmltopdf', likely a lure to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/wix?keyword=best+ceh+v10+study+guide
    • http://pochta-24.cc/51489682854tyqrd.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/06c2cfd745cd4.pdf
    • https://static.s123-cdn-static.com/uploads/4372377/normal_60002fb7ed5f0.pdf
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/7021860.pdf
    • https://fedofiri.weebly.com/uploads/1/3/2/6/132681193/wabejoveb-luzelis.pdf
    • https://cdn.sqhk.co/lowanivari/vgflhdG/jaketenatonemaga.pdf
    • https://cdn.sqhk.co/wexovezojab/khijaic/vajewupafokati.pdf
    • https://dubilovatigalis.weebly.com/uploads/1/3/4/7/134701517/4420c4c8be.pdf
    • https://static.s123-cdn-static.com/uploads/4456379/normal_5fe56459ac1c2.pdf
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/1313176.pdf
    • http://excschool.ru/338243802720tusw.pdf
    • https://poxosopetijonaj.weebly.com/uploads/1/3/1/4/131453527/b65c4088f701.pdf
    • https://wiludexubusut.weebly.com/uploads/1/3/2/7/132740186/232431.pdf
    • http://bestrongbyg.com/72231160639yode8.pdf
    • http://thefortykuti.com/16872260819g5ecj.pdf
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/wetaneligole.pdf
    • https://cdn.sqhk.co/sitopizol/BHhg5jb/takurupenutupibu.pdf
    • http://omoikiri.info/hillsboro_school_district_salary_schedule_2019-20c06l0.pdf
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/9eb55839a0f.pdf
    • https://cdn-cms.f-static.net/uploads/4481406/normal_604833d4a463a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vakizonozajaxe.onlinewebshop.net/jeux_de_cartes_fabrication_franaise.pdf
    • http://fogokenum.onlinewebshop.net/sinus_lift_techniques.pdf
    • http://sivikonalijuto.myartsonline.com/bemavasom.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f552.bin
9419da8479b476a735a0822aa20aafb41ebb4643d85de3fa339fbe768830a5b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 5268 bytes
font_01_sfnt_off0001075d.bin
4460bd545fa7e0cc8315d9fab3f5da40635df1218eea6198b8a803725fb1e9b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 11308 bytes

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