Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b0652a58284cff…

MALICIOUS

PDF

71.6 KB Created: 2020-11-20 12:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 31977d2b7d7897a8ae5bc723042a2be9 SHA-1: 913218af34a55eb0c9d7cb74bc1a79a5d2e6e54a SHA-256: b4b0652a58284cff302eb43e9110a1fdc6d10c19dcc1ba7448fb01a282a620e6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, including one pointing to 'trafffi.ru'. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially malicious content, possibly for phishing or SEO spam. The presence of many external links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://trafffi.ru/123?utm_term=taken+script+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fb299b08bc7d.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/4c7dbcb7f9c.pdfIn PDF document text
    • https://reborugavuzak.weebly.com/uploads/1/3/4/7/134736286/jovojapelexe_ludulusiviseje.pdfIn PDF document text
    • https://subulutug.weebly.com/uploads/1/3/4/3/134349811/4192643.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/nekuguvatofejat.pdfIn PDF document text
    • https://limakeluror.weebly.com/uploads/1/3/4/6/134657352/xodezod_jawisamisik_jibovuni_defowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5f89d9f19d901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_5fa4022fa359e.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/nixitegilamije.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/6df7a.pdfIn PDF document text
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/8d2fb57d6d81b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5fa16777f3fa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5f926da013662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f9f81530cf27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/kijinarapagizukujosotina.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/bobulesojek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 5132 bytes
SHA-256: ea732fa048956271226ac7769a0223ca0fb40fc347acfda6faead6373bcb1ada
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 10944 bytes
SHA-256: 8c5143211ce40e4d41c8771b2a79c861f2a868580863fc552b984dcefb64b364

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