Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7824cbf05eb86a8…

MALICIOUS

PDF

73.3 KB Created: 2021-03-18 09:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cf6d0066cf31eee6cec5141bff7676c5 SHA-1: b120fd505aa298a6dbf7a16f72399dd5dc1abb0c SHA-256: c7824cbf05eb86a8900cdfd3d37023b7f352ce7dc9e34b0625fdc876edba1ef5
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 0.9992

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://baarspo.ru/123?utm_term=cdo+full+form+in+police PDF link annotation
    • https://cdn.sqhk.co/fopavege/QvAggjd/guardians_royal_journey_cheats.pdfIn PDF document text
    • http://pefasogep.22web.org/xiduzoda.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/gcxXxgh/sniper_shooter_3d_assassin_offline_shooting_game_download.pdfIn PDF document text
    • https://texifuxifom.weebly.com/uploads/1/3/0/7/130776695/c5c595.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/XMuqVTV/hinduismus_moksha_erreichen.pdfIn PDF document text
    • http://dragonflysagewellness.com/lunudetilolalutelizaxazashg1mv.pdfIn PDF document text
    • https://felezawobo.weebly.com/uploads/1/3/4/8/134896203/2627543.pdfIn PDF document text
    • http://wiinorama.fun/590024229010jdme.pdfIn PDF document text
    • http://shtampshop.ru/ximerotuwekasajavefigaper3ltsg.pdfIn PDF document text
    • https://gexuzofive.weebly.com/uploads/1/3/4/2/134234570/bce632bbf222384.pdfIn PDF document text
    • http://stroiline74.ru/the_redemption_of_time_epubh1yr1.pdfIn PDF document text
    • http://fherixq.com/satonenaxirojinudzct5.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/hjjgicA/table_top_arcade_legends_gamer.pdfIn PDF document text
    • http://kudikadip.getenjoyment.net/59667794405.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/moduxanakuri/sunbeam_heating_pad_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/gadoe_eog_assessment_guides.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/embryology_stages.pdfIn PDF document text
    • http://pasukebufi.rf.gd/archbishop_blanch_sixth_form_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/17961757976.pdfIn PDF document text
    • http://vukotirigepiv.epizy.com/budiwikokukipisinovozinix.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/lease_agreement_template_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/5713420798.pdfIn PDF document text
    • http://viwigideburo.rf.gd/probability_and_statistics_for_engineers_and_scientists_9th_edition_solution.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 4820 bytes
SHA-256: 07d715742a289ebe4e67a055130a721570540f0796d91e31b0d8c4710f0739d6
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10768 bytes
SHA-256: 99a6a154726dc83a44898373612e9db0a67abf3343a783a1e6ad06321ece63f3

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