Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a94f45400a2541d…

MALICIOUS

PDF

69.5 KB Created: 2021-02-25 22:10:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3446f31bb0c4ee83cd1d72f640690801 SHA-1: 1729f41e8279d6e781c03bddd7a3801c7ad8fb3c SHA-256: 5a94f45400a2541d0795ecc1e70d6d84b2436e249249df9a92fa576ec2d7259a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9668

Heuristics 5

  • 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
  • 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://baarspo.ru/award?keyword=how+to+learn+woodworking+skills PDF link annotation
    • https://cdn.sqhk.co/kewudomavave/bwgcpwp/craftsman_snowblower_spark_plug.pdfIn PDF document text
    • https://fibobamoga.weebly.com/uploads/1/3/1/6/131607866/poxogiradati.pdfIn PDF document text
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/498172.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/822010836.pdfIn PDF document text
    • http://gufutaca3.xyz/80942447957tp0wa.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/Zij3ifQ/96226359944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_6011dff05cb9e.pdfIn PDF document text
    • http://begemotiks.space/vtu_electronics_and_communication_engineering_syllabusldxgp.pdfIn PDF document text
    • http://wellwork.site/22272301728nvhcz.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/wjeW8Mj/among_us_character_colors_transparent.pdfIn PDF document text
    • http://brumbum2.xyz/rabexuej6l.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/cceEsFX/13745736651.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/jej9gfV/pibones.pdfIn PDF document text
    • https://cdn.sqhk.co/gedofovel/geGOhdd/47903166415.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/MgejgtW/run_2_unblocked_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_5ff33d8b3641b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 5112 bytes
SHA-256: 97c23a777a32dfe5c9c4bec966f1d0d7ed086e5674f10ad98c3980df30038351

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