Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89731cfaaf8a6cd…

MALICIOUS

PDF

76.7 KB Created: 2021-05-23 11:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab54efe2d9dc4d4cd9f1d31cf1f9d405 SHA-1: 3e43083bff6acac9047b5063f32b856f33f43712 SHA-256: b89731cfaaf8a6cd45a6c1e4c58c174e750e2547fe82ad72d3d715cc56888215
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to other PDF documents. The primary malicious URL is https://jumiwimov.ru/strik. This behavior is indicative of a phishing or SEO manipulation scheme, aiming to direct users to potentially malicious content or to artificially inflate search engine rankings. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=what+lirr+lines+go+to+atlantic+terminal
    • https://cdn-cms.f-static.net/uploads/4406777/normal_6054870bcce7c.pdf
    • https://bonitolopulako.weebly.com/uploads/1/3/1/3/131384654/6506199.pdf
    • https://nilezejexi.weebly.com/uploads/1/3/4/7/134737846/8ee82817cf3.pdf
    • https://static.s123-cdn-static.com/uploads/4410678/normal_5fde65652e968.pdf
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5ffbb74e539fc.pdf
    • https://sunarikibuniteg.weebly.com/uploads/1/3/1/3/131381519/2728787.pdf
    • https://cdn-cms.f-static.net/uploads/4472776/normal_6052c5680e8ec.pdf
    • https://static.s123-cdn-static.com/uploads/4484156/normal_5ffd46743f5e9.pdf
    • https://nokavani.weebly.com/uploads/1/3/5/9/135966174/ca2d6.pdf
    • https://cdn-cms.f-static.net/uploads/4501989/normal_5fd787f2039cd.pdf
    • https://pulisojoperun.weebly.com/uploads/1/3/4/4/134487891/3f3805d.pdf
    • https://cdn-cms.f-static.net/uploads/4426690/normal_6033058fd955f.pdf
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/89cd5f358ca.pdf
    • https://cdn-cms.f-static.net/uploads/4494877/normal_6019698ba56b0.pdf
    • https://cdn-cms.f-static.net/uploads/4453563/normal_605fd157ec647.pdf
    • https://cdn-cms.f-static.net/uploads/4450889/normal_605bdf14334ae.pdf
    • https://cdn-cms.f-static.net/uploads/4456687/normal_606449974c6d4.pdf
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fe68be14aa69.pdf
    • https://cdn-cms.f-static.net/uploads/4380857/normal_601612e7efeb6.pdf
    • https://cdn-cms.f-static.net/uploads/4374359/normal_6033c5e6165e1.pdf
    • https://cdn-cms.f-static.net/uploads/4366627/normal_6055bffccfe61.pdf
    • https://cdn-cms.f-static.net/uploads/4378605/normal_6037a356da18d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ec81.bin
8cda9a5e25097e11cdb418bce004f99e934c78bf669f0f0bbe9042c50fe6ece7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 5228 bytes
font_01_sfnt_off0000fe2a.bin
28851932ec261df2a0eecd8be6ada42fbfc7425404bc88e53b5b716d0c601da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 11568 bytes

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