Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2067e4f1e289402…

MALICIOUS

PDF

82.7 KB Created: 2021-05-30 19:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d89c4a9ef0af3585d14498d094ad29af SHA-1: dfc09c9baa3f7d5f4dfe38c662a19dfd47829212 SHA-256: b2067e4f1e2894027d0423a5af17af643c77b96a4afe94214b8ca65686bbb35c
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', suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=balandra+cruz+del+sur+uniforme
    • https://cdn-cms.f-static.net/uploads/4418755/normal_5fd181de45238.pdf
    • https://borotopod.weebly.com/uploads/1/3/3/9/133997632/4361571.pdf
    • https://cdn-cms.f-static.net/uploads/4447640/normal_5fea19b6cd228.pdf
    • https://cdn-cms.f-static.net/uploads/4489615/normal_604cf0c9b8e58.pdf
    • https://cdn-cms.f-static.net/uploads/4462379/normal_60137749dbcb3.pdf
    • https://cdn-cms.f-static.net/uploads/4444378/normal_604313c08e379.pdf
    • https://static.s123-cdn-static.com/uploads/4366050/normal_600431630a27d.pdf
    • https://cdn-cms.f-static.net/uploads/4490269/normal_606069a75ca04.pdf
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5fe8e4f5cddc5.pdf
    • https://static.s123-cdn-static-d.com/uploads/4467019/normal_60b3372a64bce.pdf
    • https://cdn-cms.f-static.net/uploads/4470979/normal_60616b22eee43.pdf
    • https://cdn-cms.f-static.net/uploads/4367621/normal_600c82266412f.pdf
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5fe92a0a234b3.pdf
    • https://cdn-cms.f-static.net/uploads/4369143/normal_605520d3eaf5c.pdf
    • https://static.s123-cdn-static.com/uploads/4409244/normal_5fd06b053eee8.pdf
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5ff107f6c9ac4.pdf
    • https://cdn-cms.f-static.net/uploads/4497081/normal_5fd651d422a2d.pdf
    • https://cdn-cms.f-static.net/uploads/4486566/normal_60603ffa9f77b.pdf
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/3460671.pdf
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/tulubu-wupokol-juwowezip.pdf
    • https://direvegafazago.weebly.com/uploads/1/3/4/4/134491376/levizevitadoda.pdf
    • https://cdn-cms.f-static.net/uploads/4472774/normal_604645618a923.pdf
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/3790176.pdf
    • https://cdn-cms.f-static.net/uploads/4500446/normal_6037d58ed291d.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_off00010507.bin
798efa9e81c86681cf7ed25600ef1e0bfe945760c9420718c9b955b1f65fd70b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 5264 bytes
font_01_sfnt_off000116e2.bin
258fb43ef2aefffd27f0ee9c66c547086d93158d4d705f0dec197aff1fd26ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 10716 bytes

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