Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3a25605e780dbe…

MALICIOUS

PDF

71.2 KB Created: 2021-02-21 10:27:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5fddc2242552c4875f259bd2e1af9104 SHA-1: 6ed460ce62eaaab5f756ad67b3bdc8b0c4a850cc SHA-256: 0d3a25605e780dbe126875b60a960d27504d11abf90564ea1afed46d8b9c9518
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these malicious links. No scripts were extracted, but the presence of multiple external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=why+is+my+thermostat+saying+wait PDF link annotation
    • http://bizbize-yeteriz.org/what_do_you_mean_by_desktop_publishing7ay0p.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/qjgeiih/5k_to_10k_app_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fedaa9b4f503.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/bofijejoge.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/UL6mOBN/zuzisisegopixivixexole.pdfIn PDF document text
    • http://options.expert/lakajefiwib6buet.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/walmart_inventory_dayeygvd.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/dlliemE/liratozakuki.pdfIn PDF document text
    • https://cdn.sqhk.co/konumapedowe/ifjbghf/free_homeschooling_resources_for_preschoolers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484122/normal_5fec07ae4b488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_602c9ad32d86d.pdfIn PDF document text
    • https://ravaratu.weebly.com/uploads/1/3/5/4/135401011/1cde8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_5fdc7b2795dbe.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/9778919.pdfIn PDF document text
    • https://cdn.sqhk.co/riwajamugem/hbsrhbs/55946274047.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 5276 bytes
SHA-256: eed05bce5b0df066cd9d1d0d6cf14d9fc69c16bdb0fb8e327f08c49eae9a18f3
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 10284 bytes
SHA-256: 1be1fab832e6f72abdb03f272e21415144da94f739495b0a5ab9898ab76a5103

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