Malicious PDF — malware analysis report

Static analysis result for SHA-256 3770b373703a3e26…

MALICIOUS

PDF

68.2 KB Created: 2020-11-25 23:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cc82a78f17aaf3f7fa009f0790f8380a SHA-1: 775a8159cb08b98e167b7cfd63658070186c491a SHA-256: 3770b373703a3e266d76369c22dba96f807d52fe99720f3b0e5c7e9c4597ab4b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the document's structure suggest it's designed to redirect users to potentially harmful websites.

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://trafficel.ru/strik?utm_term=step+11+aa+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423453/normal_5fb955952371e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_5f9194df21997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5fa1b22345ca6.pdfIn PDF document text
    • https://gunefakojoxenaz.weebly.com/uploads/1/3/4/8/134886662/51d7701580a6.pdfIn PDF document text
    • https://mudigaxufiwibu.weebly.com/uploads/1/3/4/6/134639529/10168368855f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5f8f9e60ef89a.pdfIn PDF document text
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/kopekulizaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_5fa350be35620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5fa77ce086982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463308/normal_5fbbb013ae672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_5f9f986243f26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f9892062b338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_5f97e72b233ed.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/pilazi/kebugufunavuv.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_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 5188 bytes
SHA-256: 7c0d2cfe42e8240dffb5078e18878e2360e700a805520ffb2ba1e9357bccea36
font_01_sfnt_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 9872 bytes
SHA-256: e713ab4ae1f040eb9db94fe678da9a711169c4f1aa912cefc620b84262fc9f0d

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