Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86e1f5de68decfe…

MALICIOUS

PDF

69.1 KB Created: 2021-02-20 06:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5dd200507be82c6f33ab640fa074e713 SHA-1: a46b76bf90ce21b94d794c9576621564646a4c6f SHA-256: e86e1f5de68decfe49c8d7a5e8311b92ae02d50ac5323144e1202d4c021435d7
156 Risk Score

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 PDF contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. 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

  • 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://jacksth.ru/wix?keyword=colin+dexter+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2e8a38710.pdfIn PDF document text
    • https://wusaworapivuwor.weebly.com/uploads/1/3/4/6/134659128/7758516.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/nalelisuketipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414678/normal_5fe32ddd74e95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_60144a00258a0.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/pumilifur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fe00567950e9.pdfIn PDF document text
    • https://junanopawakeza.weebly.com/uploads/1/3/3/9/133999625/lugixenabepul_sanapoxuzejif_jedowuzu.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/fasamamasawe-vizux-nulubuduka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484156/normal_5fe418a5eff30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5ff54d2e347c7.pdfIn PDF document text
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/5200039.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/1183878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd3228808274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447089/normal_5feb63aed672b.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/perurulexi/filezilla_ftp_client_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/acretismo_placentario_por_ultrasonido.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/fifijowukak.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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 4920 bytes
SHA-256: 28bf77f2d17a44d818a47cb115fd7cdf5567d72be820f0784158c153801bbfe0
font_01_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 10016 bytes
SHA-256: 0d5c8c5fba56b2560c9fb4abec86f85c35e04e85264b322634f4e5b5be326071

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