Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb3db0944c2a30e…

MALICIOUS

PDF

63.6 KB Created: 2021-01-30 22:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c3a81aef6a738afaaace9233cdcfb7ce SHA-1: 96ebf6d50c620c978de9fe82d802f4b96817b044 SHA-256: 9fb3db0944c2a30ea2a3bcf5625070fcf365ef0cc6f9ab434d1af5e6f137c812
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://leonvi.ru/123?utm_term=breast+cancer+ribbon+tattoo+ideas PDF link annotation
    • https://jufigewadekuxo.weebly.com/uploads/1/3/1/4/131406441/gelimadafos.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/rigov.pdfIn PDF document text
    • http://vasazuruxu.iblogger.org/patterns_of_enterprise_application_architecture_free.pdfIn PDF document text
    • https://fozivumi.weebly.com/uploads/1/3/4/7/134761275/2327853.pdfIn PDF document text
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/abeb0a1b.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/depew.pdfIn PDF document text
    • http://vavawosasote.iblogger.org/rorusujusiwubokikupumok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimadijek.rf.gd/jobetibojozaju.pdfIn PDF document text
    • http://jejavonafire.epizy.com/66881512161.pdfIn PDF document text
    • http://zubumedi.rf.gd/nozitojidanijijezebuxetaf.pdfIn PDF document text
    • http://rixupod.rf.gd/kasozomojanurorirav.pdfIn PDF document text
    • http://lobulowigewimu.epizy.com/vcredist_x86_2012._exe_free.pdfIn PDF document text
    • http://laxuraxosolun.epizy.com/2681123290.pdfIn PDF document text
    • http://xidafusotiba.epizy.com/povinirisidikisev.pdfIn PDF document text
    • https://medlineplus.gov/breastcancer.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_off0000be1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1D 5092 bytes
SHA-256: b2152fc478b7f5515db23956be86457a747f5885f369efd098cc3feabcb8f9d9
font_01_sfnt_off0000cf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF72 10104 bytes
SHA-256: b36928d568cabd49f238b83a750767288e0d89de5af152fb5f35e8932e40a8b5

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