Malicious PDF — malware analysis report

Static analysis result for SHA-256 3927317324686465…

MALICIOUS

PDF

78.4 KB Created: 2021-02-28 06:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7f3baa0551ca10042c1f24be6eb2bfb3 SHA-1: 0f155ff0c9d62215570a92a55892a6bc290c4e24 SHA-256: 392731732468646582a3db1e91c56ad6603ddda5e2f83d933370e07d008110fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a strong intent to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is part of a link farm designed for SEO manipulation or traffic redirection.

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 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://xezojetit.ru/strik?utm_term=applied+calculus+hughes-hallett+5th+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/ritasuxa/jijhgii/vojube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426819/normal_5ff0a40a341fb.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/gcfgdZe/adventure_landing_coupons_buffalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_603335636b398.pdfIn PDF document text
    • https://vivexizakodol.weebly.com/uploads/1/3/1/4/131483194/1948d9323.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5fc96a38c5a73.pdfIn PDF document text
    • http://siondez.ru/teselosokupobwppkr.pdfIn PDF document text
    • http://tixshopclub.fun/lowrance_hds_7_gen_2_manual5fmt8.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/armor_of_god_priscilla_shirer_dvd.pdfIn PDF document text
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/bikoni_rubojifep_nifibopin.pdfIn PDF document text
    • http://vibawukukar.iblogger.org/4553943826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5ff2d76e9ab76.pdfIn PDF document text
    • http://begetus11ppz.xyz/land_law_2_notes6dqrx.pdfIn PDF document text
    • https://sipinawuzukefo.weebly.com/uploads/1/3/1/4/131410227/88883b9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 5464 bytes
SHA-256: 5d247b61261790b9f677a43a2d59c5fd3af4000551eebf1bb62144f19245a5a4
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 11360 bytes
SHA-256: fbd08fde3d7fafb25512efa64002b5fccaaad4787fa0fefdd93336d6809c0ee5

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