Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5762282a16757ea…

MALICIOUS

PDF

75.7 KB Created: 2021-05-30 20:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ba97afb87e5566b383ac5a34316dcf4 SHA-1: 6424d4f709d07e08432e6946a0638d2191666f6b SHA-256: c5762282a16757eaeb6a13e9703d71a9e1fb2860631727692a7bcd942b6f3510
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The document contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme, likely to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=10+ejemplos+de+hom%25C3%25B3fonos+y+hom%25C3%25B3grafos
    • https://wilaruxade.weebly.com/uploads/1/3/4/8/134865150/dijokez.pdf
    • https://cdn-cms.f-static.net/uploads/4378382/normal_60642bc1959d3.pdf
    • https://cdn-cms.f-static.net/uploads/4417531/normal_60530168bae84.pdf
    • https://cdn-cms.f-static.net/uploads/4407070/normal_60176cfb73bc9.pdf
    • https://static.s123-cdn-static.com/uploads/4389601/normal_5febc289e54b0.pdf
    • https://static.s123-cdn-static.com/uploads/4477638/normal_5feeba12c14ea.pdf
    • https://kebufuwotum.weebly.com/uploads/1/3/4/0/134040355/2a270a1065bd53d.pdf
    • https://cdn-cms.f-static.net/uploads/4480145/normal_5fd0f0fb0fc2b.pdf
    • https://dakilemuvepin.weebly.com/uploads/1/3/5/9/135963620/tufenabad-vesulumovupokej-garoruzojifo.pdf
    • https://cdn-cms.f-static.net/uploads/4370744/normal_606e5606dc3ae.pdf
    • https://jetasiduneka.weebly.com/uploads/1/3/4/5/134586997/nenak.pdf
    • https://static.s123-cdn-static.com/uploads/4421477/normal_5ff0ca16e2cc1.pdf
    • https://cdn-cms.f-static.net/uploads/4491927/normal_606c82ebddcd7.pdf
    • https://cdn-cms.f-static.net/uploads/4388412/normal_6041f7222b408.pdf
    • https://cdn-cms.f-static.net/uploads/4405654/normal_60644ac3c7b2c.pdf
    • https://cdn-cms.f-static.net/uploads/4408701/normal_5fd331c79855e.pdf
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/777649.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7fb580bd-c6f2-4c13-a9b9-895b711a5b1e/73648294514.pdf
    • https://uploads.strikinglycdn.com/files/ac65666b-9454-404b-ad0c-c7c9363dd54d/zijeniviladum.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_off0000e0af.bin
da214b800df0d25c43be393b8a872dc9616bc325c32b84a71e5ae3e898b73fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 5868 bytes
font_01_sfnt_off0000f453.bin
316f18797404c3854d14c65ec2c0193646e1486ba8700c8730a13ab196cd63ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 14092 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.