Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bd722cfa11ea26…

MALICIOUS

PDF

90.7 KB Created: 2021-04-30 13:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 119042f24b3db84c90fdcab54b296b3c SHA-1: 265cb6e5ed3ad871d17f318fd7791ea04ae0805a SHA-256: d3bd722cfa11ea26aca3baf69084240a077639fa741542562af065f05df7ebd9
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. One prominent URL, 'https://baarspo.ru/strik?utm_term=what+is+a+sun+salutation+yoga+pose', suggests a lure related to yoga poses, likely to trick users into clicking. The PDF also exhibits characteristics of a link farm on disposable hosting, indicating a common distribution method for malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classification strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://baarspo.ru/strik?utm_term=what+is+a+sun+salutation+yoga+pose PDF link annotation
    • http://pusudekevuwew.22web.org/zobotizobofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491173/normal_6028b35b79dfa.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/P4Mjjgg/infocus_software_update_tool_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424953/normal_5fe2b55b914d6.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/ZQhcTii/fejos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_6068d35d5b78c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_605ee27acc726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_60016c06cdf2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fd156668e391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_60226359065cc.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/gwCSb2I/vativumoleberidesoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485001/normal_6002565dd351d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://zurekenalemone.rf.gd/management_concepts_and_organizational_behaviour.pdfIn PDF document text
    • http://dodekogizur.epizy.com/7326517957.pdfIn PDF document text
    • http://bezexus.rf.gd/5216880138.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/60865983792.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/butufojixupixafejak.pdfIn PDF document text
    • http://dolevegun.epizy.com/morrowind_prophecies_for_sale.pdfIn PDF document text
    • http://sanagubilisefuw.rf.gd/puvaxenusawopibixosonit.pdfIn PDF document text
    • http://vemewef.rf.gd/maiden_voyage_sea_of_thieves_commendations.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_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 5100 bytes
SHA-256: 4007a9a43d982336dddd9a9da5af8d9d50d49870db2ca3cae83b337687787b0f
font_01_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 12596 bytes
SHA-256: 71180ef3642864b1fea1b9754b3e42bb0a264f53a8d2713c2c7eea785da3ef1c
font_02_sfnt_off000144f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F0 7200 bytes
SHA-256: edbccdece88ff91218ff0ce064eb1cbdadca7facce0ddc821a17fa6801a1183d

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