Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95dd43cad92411b…

MALICIOUS

PDF

134.7 KB Created: 2021-01-26 16:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ced191e0b4b6dfc9b3a9952d1760e3d6 SHA-1: 73df5b9ca132c71c138a00059d6a683b8fea0d57 SHA-256: a95dd43cad92411b10e36ded774b41f010cd664cbe8158fe7e547346164b97c0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

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://seumenha.ru/123?utm_term=how+do+a+police+department+generate+revenue PDF link annotation
    • http://best-ital.fun/funny_jokes_and_riddles_for_adultsrruq7.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/BgeIij7/kovemaboko.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/cggiago/zesenakaxirapelaxapolo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459324/normal_6005f65e37c68.pdfIn PDF document text
    • http://copyrightsupport-ig.com/business_giants_internationalh0re5.pdfIn PDF document text
    • http://mestorating.ru/app_for_bsnl_recharge_bsnl_balance_checkingu227h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480758/normal_5ff2584bb0715.pdfIn PDF document text
    • http://prodit.space/muretazenix4bbtj.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/bxrhiid/19156252952.pdfIn PDF document text
    • http://maslovauto.ru/mudemaniwitunac0cqc.pdfIn PDF document text
    • http://bostpolamos.site/lovulimopoxojdb6m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421354/normal_5fce68e0de53b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_60021b628b99b.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/yidjfW9/criminal_case_lookup_cook_county.pdfIn PDF document text
    • http://stavki.link/malazazinaduvurumarb0dy.pdfIn PDF document text
    • http://ital-tess.space/free_heart_clip_art_black_and_whitex8fzg.pdfIn PDF document text
    • http://axecheat6.xyz/messenger_download_for_pc_windows_7ab8x7.pdfIn PDF document text
    • http://promoocaoameericanas.com/minerva_mcgonagall_actressuag5l.pdfIn PDF document text
    • http://yesitalia.fun/portal_mod_for_minecraft_pocket_editionaxwf0.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/benubapopikaj/honey_boo_boo_s_mom_transformation.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_off0001d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2FF 5328 bytes
SHA-256: dcf792f53b0cadb61f168cbb50012db8dbe07f60db8e59f42764bfd5257ca7ea
font_01_sfnt_off0001e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E522 11828 bytes
SHA-256: b55ce83badfe57c90f323505b814a65b55c21d7259883f623ea5d70604298e65

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