Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95ab85350737000…

MALICIOUS

PDF

75.6 KB Created: 2021-03-01 06:32:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 141b6fea256ed6dd08d10d658615a8a7 SHA-1: 85609d4619ba7880ba5c8945e5e6d7040ebec8cf SHA-256: f95ab853507370001bb2978c9130b41952d0de51747af7e768fc8e8cd36c2687
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/123?utm_term=roman+numerals+worksheet+year+5+tes PDF link annotation
    • http://clipshd.design/francisca_serrano_libros57j10.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/planetary_gear_calculationfwq56.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/Rjghiwp/hot_wheel_games_online_play_free.pdfIn PDF document text
    • https://rusofejez.weebly.com/uploads/1/3/1/8/131856127/sosukuzabipufabefuzu.pdfIn PDF document text
    • http://compte-cmbretagne.best/codigo_de_control_universal_rcacbpgi.pdfIn PDF document text
    • https://kevosenebiv.weebly.com/uploads/1/3/1/8/131871602/d32e39896.pdfIn PDF document text
    • http://zebrait.fun/120971248782lon7.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/degajasorawimij.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/gi96ia3/sujijuropamedet.pdfIn PDF document text
    • http://look-hotel.com/11025723530hlmt0.pdfIn PDF document text
    • https://jezaxinadi.weebly.com/uploads/1/3/4/5/134597346/lemazabajore.pdfIn PDF document text
    • https://cdn.sqhk.co/didirepakavi/iPpDsge/100_bundt_cake_recipes_with_filling.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/oigvx0l/xomibexadevabus.pdfIn PDF document text
    • http://m-ryanaf.site/crecimiento_exponencial_bacteriano3pym0.pdfIn PDF document text
    • http://health-top.ru/que_hace_mecanica_industrialyy4px.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/pafexegud/garnier_pure_charcoal_sheet_mask_review.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/effects_of_smoking_on_the_body_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/rpg_offline_para_android_2019.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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 5316 bytes
SHA-256: 71b7ca44c997a7511611f30014ed6b21bfc7018a73823cd1185dce3f3bba916a
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 10372 bytes
SHA-256: de591761b80afd5326ca9ee082bf81a1b671a5a858f578dda8da8fa414b96db7

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