Malicious PDF — malware analysis report

Static analysis result for SHA-256 f624acfe31113ed7…

MALICIOUS

PDF

66.7 KB Created: 2021-01-05 21:39:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 47156ee292f78fbdbd4e66fc4d0a738b SHA-1: 06107dd4d790f2021ee7dcff9944b1f20d8ab080 SHA-256: f624acfe31113ed700a798ff4f1fb867bba6aab427db5146d54fe815c3638245
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to potentially harmful content.

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://traffset.ru/aws?utm_term=aspirin+in+diabetes+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376610/normal_5f90bce4a1554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472216/normal_5fac1d5dc7042.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/xgetSv4/45886411961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484618/normal_5fb733bc410c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fc31b6713c15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5fa6d8125599b.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/gcijnkn/dafobani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5fbdde116fd35.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/2466841.pdfIn PDF document text
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/9005712.pdfIn PDF document text
    • https://zopixidasopotid.weebly.com/uploads/1/3/1/3/131397955/lejupa-xiwupimux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb04584b-065b-4f0a-96f0-3a67612759ea/44241347192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053ff889-8b49-4cf7-bb33-0a1aa19adb87/ustvnow_com_roku_code.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_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 5256 bytes
SHA-256: 5e58c0bb83638d8b2efb7d7cceb1a70f81a096d88d969a885a217452ad61ef30
font_01_sfnt_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 10888 bytes
SHA-256: 92ebc89e0e9f2e8735533ae7be09944130c229a11dbeeb00f78a0b36a79605be

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