Malicious PDF — malware analysis report

Static analysis result for SHA-256 40800d056a315c77…

MALICIOUS

PDF

78.0 KB Created: 2021-03-23 10:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e427194787e70a06d385f87b2aeb002f SHA-1: 5c94bd3723eefa965a599938b7916e2e973e9fb8 SHA-256: 40800d056a315c77e5a460131bd337bb758a446f97f582e886a11d37b72d0177
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 0.9996

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://mezovuduw.ru/strik?utm_term=dorian+grey+movie+summary PDF link annotation
    • https://cdn.sqhk.co/desogepupema/gifhchj/change_colour_of_folders_on_macbook.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/jyZnuBa/download_ludo_3d_multiplayer_mod_apk.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/botany_syllabus_for_ias.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/8Trhe0d/fast_and_furious_tokyo_drift_cast.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/arcgis_desktop_advanced.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/place_value_worksheets_for_grade_1.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/urdu_to_farsi_dictionary_free_download.pdfIn PDF document text
    • http://dobuwiwitevotir.sportsontheweb.net/20353949428.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/iajbu8m/the_third_day_trailer_song.pdfIn PDF document text
    • https://cdn.sqhk.co/mutobudenit/hhwja5z/zombie_vs_ninja_1989.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • http://fuzuwozozat.mypressonline.com/bizapod.pdfIn PDF document text
    • http://zevupixikug.mywebcommunity.org/the_walking_dead_comic_book_series.pdfIn PDF document text
    • http://wopizup.mypressonline.com/can_i_use_my_phone_as_a_remote_for_xfinity.pdfIn PDF document text
    • http://pokinusuvato.getenjoyment.net/comparative_administrative_law.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/31574928893.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/49130045616.pdfIn PDF document text
    • https://cdn.sqhk.co/vosizijanad/eihbFec/71689354959.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tajavuminona.atwebpages.com/76035720798.pdfIn PDF document text
    • http://solarujarinobo.myartsonline.com/leadership_style_assessment_tests.pdfIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/letukenipebeziwe.pdfIn PDF document text
    • http://zimopup.myartsonline.com/carlos_castaneda_download.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_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 5132 bytes
SHA-256: 077fd27a40d79c4e51eb1db6f0c64dad851d87e15f65ce39c18d1acd7a899c1a
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 10332 bytes
SHA-256: d12cc7a01bb0402a4aec213c213a850b29e09767ae09b6e51455f79aecd017cf

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