Malicious PDF — malware analysis report

Static analysis result for SHA-256 485c663c752ab29d…

MALICIOUS

PDF

73.7 KB Created: 2021-04-09 21:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: acc315a195b1c09ef7d4ba9ac5245f80 SHA-1: 73f6d023c5da089b734953048e50f3eef8e2c6a8 SHA-256: 485c663c752ab29d697bdc2c41f8d43794ae2cd061061d274a5b410a8397c7af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL 'https://botokaw.ru/strik?utm_term=cuisinart+chw-12+filter' is likely the primary lure, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=cuisinart+chw-12+filter PDF link annotation
    • https://cdn.sqhk.co/nivunufozub/ig5idqb/multiplayer_online_racing_games_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/hicjcgj/munogademedozeliziju.pdfIn PDF document text
    • http://womenita.fun/verismo_v_brewer_manual9gfzh.pdfIn PDF document text
    • http://esclub.pro/47150635744voe21.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/Oiejhgi/gosapapezopimafewiwew.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/Hifxmgd/free_downloadable_monthly_calendar_templates.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/763615078.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/MsBlpha/fluke_115_user_manual.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/94437518715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/86662612488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee90c77e-9a33-45c0-82c9-e8120725ba56/tekegumolawoxelo.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/39588621729.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/berirowopovik.pdfIn PDF document text
    • http://nuzikenevizut.onlinewebshop.net/zokesuwaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8076ca06-90d3-4c66-bb91-a975144f214f/how_to_get_discord_nitro_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/13906290251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51cd1d2-8454-4c22-9bb5-864d38400dcf/modern_calligraphy_by_lucy_edmonds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0987f6-0c84-40ae-8cee-2c1ede3d612a/echo_cs-400_chain.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/how_to_recalibrate_the_salt_level_on_a_pentair_intellichlor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b033bc64-77f2-4f06-b9b9-b5963930c99f/honda_gc_160.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/what_is_the_best_degree_for_a_business_analyst.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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 5184 bytes
SHA-256: a2c291a1163d7580b75a4e8520f5de348c15131bf322ed0eb4f9ff5fa2026a14
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 10928 bytes
SHA-256: a3225b322476eeeb1f1740ec5ee14f87763d3c6f148685b47eac400ac034b4a3

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