Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed03a9721929870…

MALICIOUS

PDF

76.6 KB Created: 2021-03-12 08:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a1f0815d4c730bee2cbe7004cf9668b8 SHA-1: b27df671ba31209133ccfec501eb6cecbbe3181d SHA-256: aed03a972192987079c3993b164673bed56617a8c5642e48694bc3eb6cd66294
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The primary malicious URL identified is https://jacksth.ru/strik, which is likely used to redirect users to a phishing or malware site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+to+forgive+husband+quickly PDF link annotation
    • http://jokebixa.22web.org/bsc_physics_question_paper.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/brandon_ingram_jersey_number5kbob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_6046f2221e536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_60260922acb98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_602cae03b6488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5fc8fc4987bcc.pdfIn PDF document text
    • http://kukushpa.fun/what_is_the_move_objects_cheat_sims_334js5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_604ad668a8ad2.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/641c8034-0c7d-4546-bcec-2d76239b5023/59666723765.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/gezowukurasadeliderutew.pdfIn PDF document text
    • http://nusemid.rf.gd/warhammer_40k_6th_edition_rulebook.pdfIn PDF document text
    • http://mugosovexu.epizy.com/canned_heat_going_up_the_country.pdfIn PDF document text
    • http://pudusibojekajip.rf.gd/laterite_soil_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/58904208821.pdfIn PDF document text
    • http://pepebejawu.epizy.com/66265561248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfcfc45d-ed20-46a4-a666-3dad9e85ab43/ultimate_diet_2.0_espaol.pdfIn PDF document text
    • http://votofeki.epizy.com/compass_rose_free_printable_worksheets.pdfIn PDF document text
    • http://gefuxexo.epizy.com/cv_examples_templates_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 5828 bytes
SHA-256: 40cf83a0c354deab7340dd3594dd245aa287c6caa628a8597610c9d49b1fb99f
font_01_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 10664 bytes
SHA-256: 8877fe3922ebc23bb8e159dad23276bb54019ab7cce13d3fb462cf4f1bcad72c

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