Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1ced11f4f257f6…

MALICIOUS

PDF

68.2 KB Created: 2021-03-14 21:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6b75d727e8cf569ef222dc2b93779ced SHA-1: 90a14ff38f512a0f685d4cb56259874dcf228513 SHA-256: 4d1ced11f4f257f60dab5bc2a283d470462dbf4217d104c6ff29e3a11fae1986
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains keywords related to 'microchip can bus analyzer software', likely a lure to attract unsuspecting users. The presence of external URIs and a link farm indicates an attempt to redirect users to potentially malicious content.

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://baarspo.ru/123?utm_term=microchip+can+bus+analyzer+software PDF link annotation
    • https://cdn.sqhk.co/fedovipawe/7HhifuH/zamabowunaxovuzajadeposo.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/Dhjghie/best_electric_guitar_amplifiers_for_beginners.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/fefuzal.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/ygh31jf/jatanosinepuwurafatuvim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460706/normal_5fe317d900635.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/ezEXdQZ/master_bow_super_stickman_archero_fight_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482399/normal_5fd8d1a4a0b4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448750/normal_6046fe8404e25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370055/normal_5fee353d7cd50.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/vupokakuboze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_6045fedfa4fc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483072/normal_601750ae5e708.pdfIn PDF document text
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/456eefd53.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/d87610f1-d8f6-41c0-8cc3-2d3a83564142/34473567227.pdfIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_d10b7ecd4ceb4a3b9575b6d5a33df9e2.pdf?index=trueIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_4a39d1730b7e4822aee687b1154049c5.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_a2b1ca61987448e1a7de2b09fd83ed38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38355b9-c477-47db-a5e7-a8021b21b50f/79821064705.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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 5492 bytes
SHA-256: 5158a358d080daa9591d304d0bffca012db46e93f4d2e731709492cd28a68467
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 10256 bytes
SHA-256: 2edbc5888cd1921225521f6ee453db3cd0a8633c4d1254d674f2ef7ace2b744a

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