Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fa68477a8f33c8…

MALICIOUS

PDF

76.9 KB Created: 2021-03-29 17:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 12373a2787faf78bee6ae1c785c0503f SHA-1: d8517302ffae3bb5157ed06816841f16ec9d134a SHA-256: d4fa68477a8f33c8c89a83a9909447d7fc1f11f6e4040f01f7e1ddb9f34b8dd2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of 'utm_term' in one URL indicates a potential phishing lure.

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://midufefew.ru/strik?utm_term=why+float+is+not+used+in+switch+case PDF link annotation
    • http://wivaserana.mywebcommunity.org/77479340292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_5fe987a87b95f.pdfIn PDF document text
    • http://faninugure.22web.org/julidipirifoxovotapuzaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_6033bc0b21959.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/72739148790.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407789/normal_6008f1a66ee6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_603741409abeb.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/how_i_learnt_to_speak_in_english_download.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/the_brigade_pros_focus_during_the_military_decision-making_process_mdmp_is_on.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491945/normal_6011fb42c0c24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_5fdc2f6a28789.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/can_an_unmarked_police_car_give_you_a_speeding_ticket_uk.pdfIn PDF document text
    • http://bobositufunoto.iblogger.org/fulezixadip.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/why_is_my_thermostat_blinking.pdfIn PDF document text
    • http://gemajesubon.22web.org/41952175892.pdfIn PDF document text
    • http://samejeno.iblogger.org/why_cant_you_integrate_sin2x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pawesew.epizy.com/fibaxinigolowelezubet.pdfIn PDF document text
    • http://mafonevaverazux.atwebpages.com/13685563408.pdfIn PDF document text
    • http://zamutodud.rf.gd/armature_reaction_in_synchronous_machine.pdfIn PDF document text
    • http://vusevupitiwo.rf.gd/rimudiromekovaworovesutoz.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/gramos_es_igual_a_mililitros.pdfIn PDF document text
    • http://kexafaxepel.epizy.com/84621991385.pdfIn PDF document text
    • http://beranaja.epizy.com/the_lion_the_witch_and_the_wardrobe_chapters_5-8_summary.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_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 5220 bytes
SHA-256: 2c5af823358733f7c20cb9e61ef1e9cee98f3f2ec1e77a7390fcea2ce3287ce8
font_01_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 11972 bytes
SHA-256: cbba8000ab0cfaa63e8b8902868f96c3d54364786bbcd49a014057e48b21f69e

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