Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8372ff350bf1eb…

MALICIOUS

PDF

70.0 KB Created: 2020-11-23 12:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a41485c8fd2c652450f191639258a8fc SHA-1: 9b326da4eb5201528bf66c6220a7dc5ed681ae75 SHA-256: 9d8372ff350bf1ebfc00cc75077b777bbc29de67c9f202948d6381aeb018f01a
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 0.9997

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=destiny+2+warlock+exotic PDF link annotation
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/6888064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_5f90158446326.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/71dc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f8871d7639c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f90e01016b95.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/8a8cd7e9-41dc-408c-9c04-734bd830d9ca/83616683832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9868d20-28fb-4fd1-ad5b-93b73303a198/brain_training_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/chapter_11_cisco_exam_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97963596-c204-43c9-b111-8bb8dec38558/zepusit.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/antibiotic_stewardship_guidelines_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5954e94-141c-4657-addd-1f8be92c90d2/52638137671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6e5eb3-48c9-4f62-b943-4ad5a0da5b79/biposafapelufup.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_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 5252 bytes
SHA-256: ca082ac1ade209467644dfac9444bb260fd20e4c4d8e740e341a2ff9a11bd7d9
font_01_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 10328 bytes
SHA-256: 76af7c81a19ec77394546e03170d2a60d693090b94c2d6173d7ce4b1f08d23ba

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