Malicious PDF — malware analysis report

Static analysis result for SHA-256 e618059bf4d83f30…

MALICIOUS

PDF

68.4 KB Created: 2020-12-06 20:09:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 28c7f81df8a7605ceecf3525a426e7e1 SHA-1: dabfff953d3d2d916908bde991136c5224c72c34 SHA-256: e618059bf4d83f30e1de5a006206925e0bf89b0c31940a806cb64ebf0b1c7b77
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 0.9998

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/strik?utm_term=safety+professional%2527s+reference+and+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453333/normal_5fb2b0b610c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_5f937c6ae87e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5f8fd0536acfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f99b0a03f2fc.pdfIn PDF document text
    • https://duzufeto.weebly.com/uploads/1/3/4/7/134734580/e73c3373d2367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f87c7bdb4055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_5fbf1dbf8d6e9.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/cd808ba5.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/wiwuji.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/eb43ab95-140e-41bb-8462-6fd6d47a935b/xepiwa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bebbcd1e280355d37542/t/5fc2d5dcf81c9a2a0c004207/1606604255068/nekatomululesoke.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3c1c3bd14ff0dd2ae6766/t/5fc7bdca788a962b7c3ac701/1606925773532/lsu_2017_football_recruits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92693336-6adc-430e-bf86-cc65cff5d316/gokerap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bda0064-b88c-4bd2-af9d-f965e61bd053/34698770010.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_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 5560 bytes
SHA-256: 375679750723e29c6288925c205708caebfdf268eb2e2638d0a3e25a8df171e3
font_01_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 10652 bytes
SHA-256: 298df63e5ff2b84b1054ca4607b8de08fb2eb9cdfaf4eea61e69b410366d9243

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