Malicious PDF — malware analysis report

Static analysis result for SHA-256 3943899420a1ca99…

MALICIOUS

PDF

74.8 KB Created: 2021-03-27 18:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7a06327e0cb3f75f0104fe6ed23e8039 SHA-1: ee5d9eaba0b600a829bf56c6f0d30e0abfa6ad8c SHA-256: 3943899420a1ca9995e09e846fa62d84ed650061f2cee8b9190547d037e7c07e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with a primary URL pointing to a Garmin GPS lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious or spam 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://maypoin.ru/strik?utm_term=garmin+nuvi+40lm+gps PDF link annotation
    • http://konsalting.info/188697085244306a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_60223c8352ec4.pdfIn PDF document text
    • https://cdn.sqhk.co/tasiteregixo/jiZ6Rjc/lemon_pound_cake_recipe_using_cake_mix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_6023f1268ae95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_602ec6f33bb6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_6058da8719cda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385028/normal_5feb960539d23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_6021606a5e0dd.pdfIn PDF document text
    • https://vesanalu.weebly.com/uploads/1/3/1/4/131482823/0228a03.pdfIn PDF document text
    • http://beststudent.fun/allotropic_form_of_phosphorus_shows_chemiluminescenceds5r5.pdfIn PDF document text
    • http://help-ruleviolation.com/wagazupuk27n0g.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/hfriigc/93958495672.pdfIn PDF document text
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/6572544.pdfIn PDF document text
    • http://dezlice.ru/fiber_optic_communications_5th_edition3anjt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/zagoneniboloxi.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/wofizo.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/best_sheet_face_masks_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/29194665551.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_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 5460 bytes
SHA-256: 7fd7b5231743e93f59e1ed367b4a005759f0634b2b6f21a1567c628539b8fe53
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 10692 bytes
SHA-256: 9bd5f16886a81612b70d436c959a89228850271051d9f08e663111454e28778b

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