Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff479ef7032ad26…

MALICIOUS

PDF

61.2 KB Created: 2020-12-04 13:11:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c2c9a91bd6777019cf9f49c1558a7dc6 SHA-1: 9703f510310f9dc7845a85645c7f6d125cfd3d70 SHA-256: cff479ef7032ad26e7eb2ae1afae11a86d375d895e701e7d3aad88bf0bd61be2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/strik?utm_term=sincerest+form+of+flattery+crossword+clue PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445871/normal_5fa398f290df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_5f92efd4cf80c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f8cbf5eeb426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f9cc26a88dfc.pdfIn PDF document text
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/tajozinapojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5fb28de824b44.pdfIn PDF document text
    • https://pudevadiketimim.weebly.com/uploads/1/3/4/6/134606785/tadovigomipadesutag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5f8f6a9c960a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459941/normal_5fc5717d3fe7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_5fbf08fd6101b.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/5fbdeff2cb3e0f5771138fe6/1606283250978/judge_gary_darby.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fc35c799b1ed0353847eaed/1606638713523/shiv_chalisa_in_hindi_with_pictures.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_off0000b391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB391 5464 bytes
SHA-256: b99c7503539406bfe888d879adf03e2beaeaf2baf3f635315d880e9eb58bd88a
font_01_sfnt_off0000c625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 9956 bytes
SHA-256: 23d22bf3e3ff6ffe09913bbabdca284650c2d0d8d4e66c35513fb236b0c15e53

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