Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65bf3256c08fa4d…

MALICIOUS

PDF

77.2 KB Created: 2021-03-22 05:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 90d1b1196fa6b480e45c6a2e4dc80f86 SHA-1: 92bef3db35c60b9b6796c8b842ab6f5182702120 SHA-256: d65bf3256c08fa4da47e3fa9bacaca546cc1dd4e0267decab6d1e3298da202de
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the use of JavaScript for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/award?keyword=curriculum+vitae+formato+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447874/normal_6048fb524ceae.pdfIn PDF document text
    • http://fasoxuxesatilu.sportsontheweb.net/55175359428.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/what_type_of_yarn_is_red_heart_super_saver.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422658/normal_5fff97d38bb55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415055/normal_5fdcbf0b31e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_600e32c20fa09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_604461381f66e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6025b13eca946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5fee4cd37acf3.pdfIn PDF document text
    • https://zukixuvaxetili.weebly.com/uploads/1/3/5/9/135988851/7367643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dazutun/vilevar.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_d273d56a8de34b84adf9294c5c1bd37a.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_f0bcc4cbc6e74bfd92c113d979075a3e.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_8284b04af7b849d7b2159b140b1040ba.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_91f711f0b3274cd9800be52636bf6456.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/fugaxixon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 4980 bytes
SHA-256: fff25bf851fa00acd3abe4cf832c853890b1537fdb30d0b8e51824b5a4a35a52
font_01_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 12764 bytes
SHA-256: f103f8b78d3017c48c3e22195c80d434deb21925d6bae358b7f78383c5af9ba5
font_02_sfnt_off000117d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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