Malicious PDF — malware analysis report

Static analysis result for SHA-256 992d96ad5104de0d…

MALICIOUS

PDF

74.9 KB Created: 2021-02-25 15:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8b2c422c90a03e7d848fa169c5f43415 SHA-1: b63308854f4dbae232beeec474f711a653cfb8b0 SHA-256: 992d96ad5104de0dd181170fd108fc7c0a8f02bec73d313fd8f291c0934462ae
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://druttle.ru/strik?utm_term=how+to+learn+classical+guitar+theory PDF link annotation
    • http://delinapod.mypressonline.com/89027060126.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/michigan_child_support_calculator_online.pdfIn PDF document text
    • http://alania365.ru/rhetorical_question_grammary5tvf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_600ff42656d61.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/audiocodes_mp-114_manual.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/weed_eater_featherlite_fl20_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502464/normal_5fe83174d9fd1.pdfIn PDF document text
    • http://fsbsiod.com/is_valyrian_a_languagebpvuj.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/nj_transit_bus_zones_to_nyc.pdfIn PDF document text
    • http://zaduzoronogikex.22web.org/bekhayali_song_dhvani_bhanushali_pagalworld.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/formato_de_solicitud_de_empleo_gratis.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/nagev/leisure_interests_on_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/97696796874.pdfIn PDF document text
    • http://wepatimaleb.epizy.com/99302710378.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/how_to_prepare_for_a_home_kitchen_inspection.pdfIn PDF document text
    • http://ruvaseravijuged.rf.gd/fapefilijiropesob.pdfIn PDF document text
    • http://jokosen.atwebpages.com/how_much_is_tydus_talbott_worth.pdfIn PDF document text
    • http://vigekijazema.rf.gd/order_of_operations_worksheets_free_5th_grade.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_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 5216 bytes
SHA-256: 7616ecbeb60c67856c36a0adaa2f52e009678b304cb5e1589fb346de47459378
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10008 bytes
SHA-256: 7ee614e3968d0cab8cc0ab42981e31a8b9ecab9a6f5fec762c1802f3f3b80898

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