Malicious PDF — malware analysis report

Static analysis result for SHA-256 021dbf9f5ae96ef1…

MALICIOUS

PDF

94.4 KB Created: 2021-03-04 01:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 475e30918ae18648eae4cfc988d0235d SHA-1: 7eb294d57aae0dc92bbec7dbf27787d67a5b40cc SHA-256: 021dbf9f5ae96ef19e6b8a5ad1f567b90b5a7dba45c5ac4c730a4fd5d01b4323
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links 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://kuzutuzo.ru/strik?utm_term=who+won+sexiest+man+alive+2015 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486965/normal_5fe9f08d2baaa.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/stock_markets_live_world.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/Zexgdjg/hachi_middletown_online_ordering.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_60105701002ec.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/ggjihia/57410539580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382627/normal_5ffbdfd8ba15b.pdfIn PDF document text
    • https://cdn.sqhk.co/zijatiki/Jii7hg8/fepejotejaroravo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_5fdaa9d1b8d6b.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/kakotixinugegobelawov.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/jiijhel/polagukibujikasuruxi.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/3ggihic/dabunafalipovewovuwow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodirinukamole.onlinewebshop.net/introduction_to_psychology_textbook_for_high_school.pdfIn PDF document text
    • http://modunatotuw.epizy.com/livro_after_2_gratis.pdfIn PDF document text
    • http://vamudeb.epizy.com/94729605341.pdfIn PDF document text
    • http://subogerilazelo.atwebpages.com/jojopasemi.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/what_are_the_five_potential_strategies_for_conflict_resolution_in_teams_recommended_by_maginn.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_off00013229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13229 5512 bytes
SHA-256: cb8873a954a4d863b90981206526938bdfb5a38b674b8d033db3159f4b02b169
font_01_sfnt_off000144e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E7 12048 bytes
SHA-256: 2439fbf4e5c37fbd7108fa1c4e96997e313a54ba3f0155f97f39e750d73a41db

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