Malicious PDF — malware analysis report

Static analysis result for SHA-256 891e67f739e28503…

MALICIOUS

PDF

70.5 KB Created: 2021-03-03 06:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f093e37b998f109044294357d4e9e28b SHA-1: 0424055db98148723500eff9a599fd5f87c1eeb6 SHA-256: 891e67f739e2850322d314d9d5cbdf44452666f62a99b20c6a42fb5ceef85cfb
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://dugedepap.ru/award?keyword=wilton+cake+tip+chart PDF link annotation
    • http://bioforce-co.site/brave_disney_movie_free63d2p.pdfIn PDF document text
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/kinuxuvi.pdfIn PDF document text
    • https://vetaguluxidi.weebly.com/uploads/1/3/4/6/134656260/2626586.pdfIn PDF document text
    • http://luzikudejijes.22web.org/vujezemaluson.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/dQjfyyr/supertux_0._3_3_download_windows.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/16809560602.pdfIn PDF document text
    • http://waliduv.mypressonline.com/96_yamaha_kodiak_400_carb_adjustment.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/hfC65MM/pixel_gun_apocalypse_unblocked_games_76_ez.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/ccjcjaB/frozen_2_4_in_a_row.pdfIn PDF document text
    • http://my-favshope.online/factors_for_abolition_of_slave_tradee659n.pdfIn PDF document text
    • http://kazoxizodasese.iblogger.org/aashiqui_2_picture_gana.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/wewat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumazuk.rf.gd/93225671289.pdfIn PDF document text
    • http://bipupobipe.rf.gd/bismarck_foreign_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/fezakesadosasow.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/xifixevex.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/aguner_poroshmoni_song.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/niremisitedexalipanejixej.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_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 4920 bytes
SHA-256: a0f93e151d5c8a4a0bf56c9661c8d2993f858b175df7b83adc2fdbd2828e43aa
font_01_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 9904 bytes
SHA-256: ac64426836e0ffdd3b4a8f84be0b3df24e4d88d08540eb845f72f7aa974216a6

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