Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b242eaee2a0aba…

MALICIOUS

PDF

92.6 KB Created: 2021-06-08 21:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fb6b729c08e3550fad96ec4a5d0fafab SHA-1: 18189a82ff94f0e52ac62291b16632e2645ece13 SHA-256: c0b242eaee2a0aba70ae2ed8af45fdec7cdafe27e9bd216050ba30cce758d641
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary suspicious URL pointing to 'irlanc.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8218

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://irlanc.ru/pbw?utm_term=pathogenesis+of+leishmaniasis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456999/normal_603959254ba12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_6037927652063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454170/normal_5fcdfd0c63809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_6064cb5cc5244.pdfIn PDF document text
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/kinuxuvenofewetimogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_601138d18c4a2.pdfIn PDF document text
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/a52082bb822d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemeganavon.pbworks.com/f/assistir_invaso_zumbi_2_filme_completo_dublado_superflix.pdfIn PDF document text
    • http://kikipudojuzo.pbworks.com/w/file/fetch/144510381/67912470264.pdfIn PDF document text
    • http://xeninexiruvo.pbworks.com/w/file/fetch/144833115/24425607445.pdfIn PDF document text
    • http://xofitesu.pbworks.com/f/54298334138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f2ad32-327f-45b1-a0d6-d92067ca696d/babubagamexurukoporew.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/w/file/fetch/144838977/rarabe.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/what_manga_chapter_is_attack_on_titan_season_4_episode_9.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144880491/70836855127.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/john_deere_z225_belt_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d5927d-20a3-4586-93b1-18e53ffdb499/5711824881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30aae953-3f5b-4cea-94b6-8331409bd81d/suridas.pdfIn 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_off00013e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E46 5148 bytes
SHA-256: 28111155a37f0f10698ff128eb54a7e0a4642c10369da26642170933b8b73828

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