Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c4d975870081ab…

MALICIOUS

PDF

81.4 KB Created: 2021-04-06 12:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8ac29514656ad4b3c6263e46a55ee3bc SHA-1: c903400b5310b1b7a28096fdb90d6bbb1afd1699 SHA-256: 91c4d975870081ab71f6fc47c48a8d6055050e0fcfd9844046aaa991f1759c06
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document contains a high density of embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attempt, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://soxebez.ru/strik?utm_term=lord+of+the+flies+chapter+7+summary+shmoop PDF link annotation
    • https://cdn.sqhk.co/supetudoti/B1tjfjh/baal_veer_2_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ff28ed2c7153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_5ff603ed89e3a.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/r_spatial_analysis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5ff554c3d44e2.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/f4HjiLl/adventure_escape_murder_inn_chapter_4.pdfIn PDF document text
    • http://gavojutopubiri.getenjoyment.net/49496183362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5fc76fd4c8776.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/dghzqVx/jazuzolututesukiv.pdfIn PDF document text
    • http://tuzotumefakorok.scienceontheweb.net/zilesugejeweb.pdfIn PDF document text
    • http://lulamugateso.mypressonline.com/40236322289.pdfIn PDF document text
    • http://tamawasobo.sportsontheweb.net/isaiah_berlin_historical_inevitability.pdfIn PDF document text
    • https://cdn.sqhk.co/kuretunaba/hjhbgdi/block_puzzle_2020_earn_money.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/lKetpjb/best_craft_beer_delivery_london.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/98975508222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_5fdb342a5482f.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/sotuwetegupiji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_3a9eb0eb4918405998a38ee44399ae66.pdf?index=trueIn PDF document text
    • https://3012fa3b-51b7-4264-898e-e15d6fab1eb1.filesusr.com/ugd/ee5524_5b35758d47b24d19bf9cbd3b0b988059.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d872fec1-8d19-4c06-908d-b80a4933ae7d/32475264622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8674ab6e-6ff6-4114-ad62-a24638bc5783/evenflo_car_seat_with_base.pdfIn PDF document text
    • http://bobixupeto.myartsonline.com/paper_chromatography_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f944a0cc-02bd-4a0e-8788-961971e31b94/60433995720.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_2655feb601df4d54b896021d62d83640.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9ebe67-f339-4307-8ccf-ec7b170e6358/best_web_design_books_2020.pdfIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_a762e9c211ec4cf2bf1a5e177dbeb30b.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_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 5520 bytes
SHA-256: 56d72c623d70432c089e5886afef49b336a2cc4c648e468cce7e834c627be686
font_01_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 10700 bytes
SHA-256: 56b7d39c08a1eabc1f6d9f0ce7650b405c1be7ee148bee8dbc63a8464bd1d56a