Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87342d2827666f9…

MALICIOUS

PDF

73.6 KB Created: 2021-02-11 00:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 270ace531c524014a7d2342d4e96f184 SHA-1: 542d90bb59aa54df1060c86d2ddaf0a7c118450d SHA-256: d87342d2827666f9879dc7eed00478f69d3b250da1a69d7f9bb7fcb79c56237a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the primary one being https://maypoin.ru/123. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to external sites for further compromise.

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://maypoin.ru/123?utm_term=key+signature+worksheet+treble+clef PDF link annotation
    • https://cdn.sqhk.co/bigulikexupa/ziiw7ig/tyre_repairs_near_me_open_now.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/kewepiva.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/li_ch_play_khng_c.pdfIn PDF document text
    • https://mugibamarenov.weebly.com/uploads/1/3/4/1/134109107/faa1cb3adf.pdfIn PDF document text
    • http://ludokebisiw.iblogger.org/photoshop_frames_templates_free.pdfIn PDF document text
    • http://dostafood.xyz/tracteur_renault_super_5_puissancen45dq.pdfIn PDF document text
    • https://nepejudakolop.weebly.com/uploads/1/3/4/8/134876169/livadajopofuwol.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/hjYT7hc/best_bouncy_seat_for_baby.pdfIn PDF document text
    • http://daravto18.ru/volume_of_frustums_worksheet_tesvovg6.pdfIn PDF document text
    • http://nashremont.site/the_absolute_basics_of_the_christian_faithus94j.pdfIn PDF document text
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/8985270.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/jjbnSlC/66009366823.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/7b48097e.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/jdgishc/dragon_ball_craft_games_for_ppsspp.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/49e280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusaxedufa.rf.gd/kikupelavuminife.pdfIn PDF document text
    • http://segudufarus.epizy.com/call_of_duty_2v2_alpha_pc.pdfIn PDF document text
    • http://tuxizosog.rf.gd/57363112699.pdfIn PDF document text
    • http://sabinozugi.epizy.com/student_loan_payoff_spreadsheet.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_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 5512 bytes
SHA-256: 54488b7eefe0f07fb270d2cea38946d00d2b764de47c038d9ae841104388e106
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 11524 bytes
SHA-256: a6aad7d6a459c8aa15e687bb053cdb3c5bdb9d84f06ba3e466458f7579f21150

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