Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e39a06d70e33eb…

MALICIOUS

PDF

69.6 KB Created: 2021-02-20 19:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 50649f3d1270d2b26d6cf98eea39ec5c SHA-1: e0a78c8bb932ede35420a73bbd72ae58977be0d8 SHA-256: 81e39a06d70e33ebac104a68f89f4694630178449f151ca8e883c09e6a810b49
126 Risk Score

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, many of which point to link farms or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than a legitimate document. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

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://bologen.ru/wb?keyword=entire%20dictionary%20copy%20and%20paste PDF link annotation
    • https://cdn.sqhk.co/kosenopelid/gcm4iac/burger_king_near_me_breakfast_hours.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372087/normal_60044d2241522.pdfIn PDF document text
    • http://samozanyat.info/masters_in_public_administration_salary_canada1rkjw.pdfIn PDF document text
    • http://argo-tourism.com/girimixudakudikexolenl6vct.pdfIn PDF document text
    • http://batmbatm.ru/the_trails_at_mt_moriah_application5hnhg.pdfIn PDF document text
    • http://carinsusa.com/descriptive_and_limiting_adjectives_worksheetrmubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_60164f5098aa2.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiziluda/HjD4jiJ/52345210535.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/algTukx/44806109615.pdfIn PDF document text
    • http://matras-24.ru/forozoknu6am.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450641/normal_6009468f1b6a4.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/jm6ggji/80536215450.pdfIn PDF document text
    • https://cdn.sqhk.co/tidaxetosi/V3jdDij/lovecraft_country_season_2_confirmed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476011/normal_5fca61e4ad6bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369797/normal_60004b6f7a388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejivexol.epizy.com/96069753994.pdfIn PDF document text
    • http://goseletew.epizy.com/andrea_mitchell_reports_9_3_19.pdfIn PDF document text
    • http://gijomifede.rf.gd/woxafu.pdfIn PDF document text
    • http://kosener.epizy.com/ajax_javascript_file.pdfIn PDF document text
    • http://joluror.rf.gd/economist_intelligence_unit_country_report_cuba.pdfIn PDF document text
    • http://vanuzavabew.epizy.com/21068592529.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 5092 bytes
SHA-256: 681281bf39cb2a5db0c793d0a0891b5a00275e7ef32dd10d549e2b376f3e828f
font_01_sfnt_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 11708 bytes
SHA-256: be935a7840b404db75538cf7bcd4e99f2857fb9a4472b69805ce5a7568c580c6

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