Malicious PDF — malware analysis report

Static analysis result for SHA-256 50edd34a070632eb…

MALICIOUS

PDF

72.3 KB Created: 2021-02-08 20:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: efcd3c90b2f03d709a7ea678daa9221b SHA-1: aa483088a1982da391f407344886ed49978e08a6 SHA-256: 50edd34a070632eb2400e2d595032b32dfa33c70fa24e4ad40154e501239cb45
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to other PDFs, suggesting a link-building or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://leonvi.ru/wb?keyword=backup%20contacts%20app%20android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5fe0fb48cc9f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5ff015ccd5052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5fd959de9d40d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421776/normal_5ffe6f8ee67c6.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/13be997b79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5fd9e00b5b605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5fe903a59208f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_60095f1ba8748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_6015749ad0fef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fc855769f3fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472206/normal_6000a0ec8f252.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidovarodefomi.rf.gd/docket_sheets_massachusetts.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/62494685770.pdfIn PDF document text
    • http://wojobawezelo.rf.gd/payzapp_apk_new_version.pdfIn PDF document text
    • http://xunonevikonog.rf.gd/enrolled_agent_online_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/perbedaan_uji_parametrik_dan_non_parametrik.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_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 5148 bytes
SHA-256: 5f231a1b5a39b0511dae667063b3e566c7885164b2a1c7cc77ebdfd14c8126a9
font_01_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 10372 bytes
SHA-256: eb452559160c9e51f8a738140c0aab21d03429b4728eac22919762f160e75784

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