Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc0e6a777ab7a86…

MALICIOUS

PDF

77.4 KB Created: 2021-03-18 14:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c36b20bcb5859b39bc6258c26ecd93de SHA-1: 4ee540393928ff9f3196820484c7486dea90420e SHA-256: afc0e6a777ab7a86bdb81904ddf5961fb1a5d9fc2fdc7e7c4e35380807fcd89b
126 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain, likely serving as a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, reinforcing the phishing or malware distribution intent. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=clicker+keypad+programming+wayne+dalton PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402252/normal_602b6d9419d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_60377c9bb8a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457854/normal_604fa407d2789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408460/normal_5fc61ef8709a0.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/dabexek-sijapazemases-fofos.pdfIn PDF document text
    • https://vegivuben.weebly.com/uploads/1/3/4/6/134660922/1140137.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/jofon.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/call_me_by_your_name_peach_scene_excerpt.pdfIn PDF document text
    • http://nawogevimogagu.22web.org/64765081728.pdfIn PDF document text
    • https://jofusowosa.weebly.com/uploads/1/3/4/7/134764533/4981648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_603b22fb94429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woniziraf.epizy.com/bear_cruzer_g2_arrows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0862f9d-ec75-4348-a507-b7ce304eb4dd/what_is_advancetrac_rsc_2005_ford_explorer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/631b80df-dfd9-480c-b02c-730a250cf4f1/pujuvegefegabipopiterola.pdfIn PDF document text
    • http://bepinutarefe.rf.gd/cambridge_checkpoint_science_past_papers_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97579a6-4b11-40fb-9ba1-fb7d718fcecc/world_leaders_quiz_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8574b3-de2d-434f-8e68-13167ca60ce3/does_going_to_ranger_school_make_you_a_ranger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ceb5fa-ae09-42b7-9b9e-ddc5eca8d878/the_pillowman_book.pdfIn PDF document text
    • http://sujuletabekomus.rf.gd/kapumome.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/xudokodudiniboferitukivid.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_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 5380 bytes
SHA-256: 6a6ffc4a92cae15562202b4eee932300482718bb27822670a1fe950d55b4ecd6
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 13516 bytes
SHA-256: 6eaa0f512e3d5517b91c5a3f8f5193291aef0a9cfe151079f591d379131783b6

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