Malicious PDF — malware analysis report

Static analysis result for SHA-256 82029acc85bb3e56…

MALICIOUS

PDF

90.1 KB Created: 2021-02-24 19:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 18e0f3dc9fb529f4538ad5116a031f93 SHA-1: 94e3bbc3571116c5dc19b432f0f6865549c338b2 SHA-256: 82029acc85bb3e5626dd8341a33e596fed07473cefed6d073717fcac8fb99c27
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to mimic search results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to a link farm strategy, suggesting the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=accounting+text+and+cases+13th+edition+solutions+manual+pdf+chapter+2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485927/normal_5fc9860d401a6.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/GxhfdPH/wisedux.pdfIn PDF document text
    • http://reduslimitalia-official.website/panda_docs_workflow3xucm.pdfIn PDF document text
    • http://mihetos.xyz/biogeography_freedbj3f.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/gexivowazunudovoxevadurlozcx.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/heafhhP/dream_daddy_hugo_x_damien.pdfIn PDF document text
    • http://idealicacolumbia.site/alkaline_acidic_food_chartyannm.pdfIn PDF document text
    • http://instacopyrightcenter.com/bebedukulopwok9.pdfIn PDF document text
    • http://erogan-oficial.site/bazzi_mine_mp3_downloadlhmey.pdfIn PDF document text
    • http://sevastopol.sale/6284377745rxrrf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_601967d050de6.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/Hj3Ruje/celestial_pearl_danio_for_sale_australia.pdfIn PDF document text
    • http://wordsidepost.top/38224022355x69q3.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/jeneBFZ/10161005525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480402/normal_6004ce258c5b0.pdfIn PDF document text
    • http://akfb.online/83433267742mktm6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_6030e620a29bf.pdfIn PDF document text
    • http://kyponnik.online/atul_prakashan_books_diploma_computerk1lb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwosopawekaz.rf.gd/76141437938.pdfIn PDF document text
    • http://benipibidi.rf.gd/62455512125.pdfIn PDF document text
    • http://vetovolixexa.epizy.com/kaer_morhen_trained_guide.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_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 5972 bytes
SHA-256: 3e86c3c7f67700974ff72950b182bb6aef98b43b7f8620c4e11ae2002b0a789e
font_01_sfnt_off00013477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 11088 bytes
SHA-256: 7a0ec5275799d53f3ecdd85b78b95bbfdf54649d4357dfd13156aeac7dd44ad9

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