Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5b88772e36d5cc…

MALICIOUS

PDF

65.6 KB Created: 2020-12-16 14:17:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 47e3395fbcbda10a380e2b88bc59442a SHA-1: 5329e2700db7b87e40184c3b7739cc983309bfd3 SHA-256: cf5b88772e36d5cc19a8ade03c2e7093e2392ab7826fa31838d5dab4757d7a94
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 phishing or trojan threat. The embedded URL points to a resource offering a "windows 10 home edition activator free," a common lure for distributing malware or conducting scams. The PDF structure itself contains numerous external links, suggesting a link farm or redirection mechanism designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=windows+10+home+edition+activator+free PDF link annotation
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/1388d7067068dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_5f93fc95e0d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f8b9d06e2147.pdfIn PDF document text
    • https://fimuvuxufubewi.weebly.com/uploads/1/3/4/4/134442536/waxinazoni-fififabizi-givixapidujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_5fba35276dc47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5f9a2cde7ff8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe01539d7936484055010b/1606287700449/53643154124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d77711-19e4-4051-bf3b-f8541e889e1f/suspenders_for_kids.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc102e7bda9c57a97beca32/t/5fc14f7ffa04221c715051cd/1606504320979/sujiwuvigajawude.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5de1b7848ba205d3add58/t/5fc6b0049b1ed03538cb36d0/1606856709902/pitekagatodobasipuka.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6df4944e997374a292d60/t/5fcd6b4bf94b6402b22e2d8e/1607297873017/jumia_black_friday_phones_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a98ea2-5b1a-4d27-86ec-dae9a57911fc/98785367929.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_off0000c48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48C 5588 bytes
SHA-256: c3ee20781d9ef7befa49e973f3b95c5c356c821c5d13bfd0aa20c075bc36f558
font_01_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 9952 bytes
SHA-256: 7338a637eab084a44dc17ed2e639095f9ab6b22a5efcf865082b668e3795e3e6

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