Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e721cd9e56e3439…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 23:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f164c36b0184059a97a5ca0e232b3bf1 SHA-1: b407cc831bbfc8da8bc1668e40ce148f7af20696 SHA-256: 9e721cd9e56e34393e104a54f5de03fe8650f777307f190c6a069dfe74df3beb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=horse+diving+into+water PDF link annotation
    • https://cdn.sqhk.co/pirujezexod/eENias3/lavidubiju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413719/normal_5fc892ff26131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_605b8fd762e95.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/cvGiajc/movie_star_salon_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/Oxijjhy/word_trip_luxembourg_puberty.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/bChiijB/33807766404.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/NMsjakc/mixomi.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/hhghh3O/31538619208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409246/normal_6006bab89d861.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/1gjlXij/elements_of_design_in_art_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/ftc5jjZ/83788384838.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/d6hb58B/ac_market_apk_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454681/normal_604a89301ba9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_605abe8b5d037.pdfIn PDF document text
    • https://cdn.sqhk.co/nujamuxeg/gigghgi/function_generator_and_oscilloscope.pdfIn PDF document text
    • http://meliwatamuje.22web.org/call_of_duty_cold_war_pc_requirements.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_a7bb036bb455461a9589afd0158bf4b3.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_02620ef1c4fb459fa7f099c31ba2078e.pdf?index=trueIn PDF document text
    • http://kibulirol.rf.gd/55867075969.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_69fba5ea388c438882a6050bfb1d097b.pdf?index=trueIn PDF document text
    • http://nowumotugolate.epizy.com/cable_types.pdfIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_10e752e255274cd09436ba87addca3b8.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_eb6f645a634a4ae7939863166c118c43.pdf?index=trueIn PDF document text
    • http://bitoliwutusire.epizy.com/chale_aana_whatsapp_status_full_screen.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_6e35df860ff94daeb7948562f39d8026.pdf?index=trueIn PDF document text
    • http://tawegimasozaj.epizy.com/annayya_songs_chiranjeevi.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_31c56d949b454320983d5733f3208208.pdf?index=trueIn 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_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 5072 bytes
SHA-256: 07ff5ecdbcc3df8c963c844e0cdb9642b7d4bdad071258506e74c9bbad5e688a
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 10924 bytes
SHA-256: de8a9575c452dafb122d20d6e80b6be57572ed021fa665195f281c791a336d60