Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b203be4496278a…

MALICIOUS

PDF

83.1 KB Created: 2021-04-16 02:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6515ef0ce9acf192153a56ebf4566194 SHA-1: db9b84dc94c7b5e427e7777e53f106d6d6f90687 SHA-256: f3b203be4496278a536d897277c2f1ce13d6a8ccf107a84d52c91e99f757cb59
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, indicating it is part of a link farm designed to redirect users. The primary URL found is 'https://zajinet.ru/strik?utm_term=what+to+make+for+dinner+with+no+carbs', which likely serves as an entry point to a malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=what+to+make+for+dinner+with+no+carbs
    • https://pudafeborebe.weebly.com/uploads/1/3/4/3/134335494/76567e2ab.pdf
    • https://vusuvorolom.weebly.com/uploads/1/3/4/5/134501440/sutav.pdf
    • http://zoosalon.org/89160224474g13w4.pdf
    • https://debimagobu.weebly.com/uploads/1/3/1/6/131637583/katasevuxuzibupuvoxu.pdf
    • http://apparentlyopt.com/35764702875iaq0c.pdf
    • http://umniashka.ru/60280349567qfv92.pdf
    • https://vilaferadir.weebly.com/uploads/1/3/4/7/134771168/xatapi_vupimunojopuru.pdf
    • http://afracheat5.xyz/studying_public_policy_howlett0jjd2.pdf
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/3840705.pdf
    • http://wemuwetafivaxe.sportsontheweb.net/fivejirutilazabidiwunel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_0a4edc99390247edb3ce10a2634ce05a.pdf?index=true
    • https://s3.amazonaws.com/jevedijadiki/roseguvadulowinutabijodal.pdf
    • https://s3.amazonaws.com/dosalapasenow/76905937.pdf
    • http://wutesejib.onlinewebshop.net/persuasion_jane_austen_movie_where_to_watch.pdf
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_3733cb8e85e44440b022801000554000.pdf?index=true
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_e080c73bc32d4d59acf346afef4eb1e7.pdf?index=true
    • https://s3.amazonaws.com/rufonali/dune_board_game_rulebook.pdf
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_1aa7f2263ca64531aeff799554443526.pdf?index=true
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_f894ffc441b344a4ba0d21f5fd46e2dd.pdf?index=true
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_e64fef15ddc44ee796757178ec18fd91.pdf?index=true
    • https://s3.amazonaws.com/zidenigad/17825183866.pdf
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_643d179be64c4087a989dcef6c84a80b.pdf?index=true
    • https://s3.amazonaws.com/zugutixe/guide_de_lgistique_rdaction.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010721.bin
8b66887c0c09b16cc4c297aeef3f61bb05a6cf00893cbb5d5c868c67672f0c52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 5536 bytes
font_01_sfnt_off000119e5.bin
0aad1d2467afb39676a2c702c710e7f96af6642c64ae968afd85c57c1e679a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 10936 bytes

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