Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7926bec6e1f02d…

MALICIOUS

PDF

87.2 KB Created: 2021-03-03 21:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 45c90bf978147240407fca7deb6ddddb SHA-1: bb52ff30e233c1564ec2b9fb55685915543e0c06 SHA-256: ad7926bec6e1f02dc3fcbd02f5aa2bc5232c2e48c1fa664d02831a2c2d530f28
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=ma+mi+mu+me+mo+katakana PDF link annotation
    • http://juvizex.sportsontheweb.net/jack_and_the_beanstalk_short_story_for_toddlers.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/latest_electrical_electronics_engineering_jobs_in_nigeria.pdfIn PDF document text
    • https://zizovelet.weebly.com/uploads/1/3/1/3/131380569/60cf55.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/cphcOii/submarine_simulator_naval_warfare_unlimited_money.pdfIn PDF document text
    • https://gifezimudafero.weebly.com/uploads/1/3/4/3/134312010/4159451.pdfIn PDF document text
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/9437507.pdfIn PDF document text
    • http://nakozek.mypressonline.com/6411900451.pdfIn PDF document text
    • https://zuzameponotu.weebly.com/uploads/1/3/1/6/131606203/ziresezevovofef.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/joggd4f/alone_pic_boy_dp.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/danby_mini_fridge_parts.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/xasidagunulol-towasesijibugu-mezipigix.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/hp_laserjet_p2015_new_printer_price_in_pakistan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sebokegekesuded.atwebpages.com/pazuzuligigudofuzub.pdfIn PDF document text
    • http://gafodix.myartsonline.com/fukidumiperixezo.pdfIn PDF document text
    • http://tebokemirutexus.rf.gd/poropegalimasugano.pdfIn PDF document text
    • http://joxowosikaze.rf.gd/operations_research_masters_canada.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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 20140 bytes
SHA-256: 7ef7337686d54953c55ff0a16b427414190cab68bd1ff665cbf100078da52ad2
font_01_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 4592 bytes
SHA-256: 7ac5710b0700f643003ea5869c777edda4a68dd7bd18175825da4d019a7e1908
font_02_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 9876 bytes
SHA-256: 70a14f0991824f1a887f97acb1e5d4fe8d15336a0dced88920a00ebeba0181d6

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