Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3e315708260e47…

MALICIOUS

PDF

87.7 KB Created: 2021-02-22 17:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f46946ab07ccb60270f89d825136f160 SHA-1: c42a7173e09ebd9bb8c501980d6a3323124b7051 SHA-256: ec3e315708260e47fe377eafdc070d4bca1236c6f10ae7ce07bf1a84bc99cd28
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary URL, 'https://jottigo.ru/strik?utm_term=how+to+look+up+driver%2527s+license+number+illinois', is likely used to redirect the user to a phishing page.

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://jottigo.ru/strik?utm_term=how+to+look+up+driver%2527s+license+number+illinois PDF link annotation
    • http://imkl-checker.com/22109126564smksn.pdfIn PDF document text
    • http://zufefusu.iblogger.org/jersey_mikes_menu.pdfIn PDF document text
    • http://figebofisekozoj.22web.org/92526448034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fd76fd4af126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496193/normal_601f0fdbc893d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490524/normal_5ff1e74c38147.pdfIn PDF document text
    • http://dkmz1.club/ariel_miramontes_desnudomtc8j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_6008738116238.pdfIn PDF document text
    • http://ribupisid.22web.org/bematech_mp_4200_th_user_software.pdfIn PDF document text
    • http://rubka.space/begipedawizop78tji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484143/normal_6033384f4dfb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490539/normal_602fce03ccaaa.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/bisiku/23975194398.pdfIn PDF document text
    • http://jefusebu.epizy.com/str_dn840_bluetooth_not_working.pdfIn PDF document text
    • http://xuperag.epizy.com/90110366920.pdfIn PDF document text
    • http://dasudigakufise.rf.gd/autonomy_in_medical_ethics.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/47080113208.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_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 7328 bytes
SHA-256: 43ed1ceb8fabdba8d12feed00b2b18a6903d5ac90cfe67895d29953a70570647
font_01_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 5360 bytes
SHA-256: 02917f2b0a1c449b990bceb12dbd6605ae1e0657287b1495efb948a471527c52
font_02_sfnt_off000128f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 11916 bytes
SHA-256: 8a372650708f6f3296854cf9792954e34d4ad2edd5eeec0f8f42e91721563ecf

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