Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09dee0838cf1b8d…

MALICIOUS

PDF

75.9 KB Created: 2021-05-07 15:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4a525dc2ca26b7d9253c456ebb1ae445 SHA-1: 28c7a1478aa168983bc88f5db864317a7d9ba9ce SHA-256: d09dee0838cf1b8dc317f712c79bd1ee1377ee8eee072f423aafc625a9f092f4
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('kuzutuzo.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further supporting a malicious intent. The ClamAV detection and ML classifier strongly indicate malicious content, likely related to phishing.

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://kuzutuzo.ru/strik?utm_term=solving+multi+step+equations+with+fractions+worksheet+doc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424645/normal_60442110047e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_60412bfdea6dd.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/cu1CVjg/98715193737.pdfIn PDF document text
    • http://boludibaderujir.22web.org/sigalujukob.pdfIn PDF document text
    • http://weraka.online/bojirebonolenavih072h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420910/normal_602f1fda37b3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_6041b3460507e.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/ahg6ehh/raxibobolatawaruzubikodon.pdfIn PDF document text
    • http://static-get.top/colorear_lol666o4.pdfIn PDF document text
    • http://yewes.space/how_to_troubleshoot_my_maytag_dishwasherczuoc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_a363434834954765902d50de604b42f2.pdf?index=trueIn PDF document text
    • https://7a6021ad-ea99-40b3-bafb-6570e045b460.filesusr.com/ugd/527ec5_5108e9f023dc4e568d4461af87a632b5.pdf?index=trueIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_bbc4b560bd794352bfb51c814a268780.pdf?index=trueIn PDF document text
    • http://fokotizemol.rf.gd/dizujisalepade.pdfIn PDF document text
    • http://rujonane.rf.gd/how_to_replace_fios_battery.pdfIn PDF document text
    • http://lebiwubeso.rf.gd/what_is_a_reproduction_in_art.pdfIn PDF document text
    • http://vatududo.rf.gd/34018004135.pdfIn PDF document text
    • http://ragipop.rf.gd/94805825670.pdfIn PDF document text
    • http://tixelupaninaber.rf.gd/felinogu.pdfIn PDF document text
    • http://mepoketefetur.rf.gd/little_house_on_the_prairie_hardcover_book_set.pdfIn PDF document text
    • http://sabepusejoponi.epizy.com/21275998970.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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 6012 bytes
SHA-256: 77ed28d2cd6484366859daf4befc175e1762fa083877789a979e4258d9403527
font_01_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 10776 bytes
SHA-256: 1510e1e1a070d2410c7e07fac3af6202a23ef7d45a4bb6869e20bafd0b4b0753

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