Malicious PDF — malware analysis report

Static analysis result for SHA-256 05479f26002ec2a9…

MALICIOUS

PDF

75.8 KB Created: 2021-02-22 15:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 60fd6efb4826b248206d62ec723ffc7e SHA-1: 4fa533bb3995b9d09fb0f165181bee4382fc4f0d SHA-256: 05479f26002ec2a9731f0cffe57f19eccaa27b94dfe5b7263df3f7c951ff3a80
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

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://leonvi.ru/strik?utm_term=what+size+tires+does+a+2014+chevy+equinox+have PDF link annotation
    • http://keepmaxi.space/pivodacg6zx.pdfIn PDF document text
    • http://ourfutures.space/gitasesilujojagivegokojotdai.pdfIn PDF document text
    • http://itsnat.space/inside_out_movie_in_tamiljgagw.pdfIn PDF document text
    • http://complect-tech.ru/wifi_driver_update_hp2z6vq.pdfIn PDF document text
    • https://voromelub.weebly.com/uploads/1/3/4/8/134872571/8462616.pdfIn PDF document text
    • https://cdn.sqhk.co/salosegebomi/h1guNH3/mefisifasonebakerejat.pdfIn PDF document text
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/fekobo-durugejeb-jukoxi-xisigajuwo.pdfIn PDF document text
    • http://songkfrk.site/pimiwezupidomijoredp9cq.pdfIn PDF document text
    • http://carbags.site/zazofebonuvajedorimukqifuw.pdfIn PDF document text
    • http://ubzvp.com/686884839294l837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421330/normal_5ff280d13c4e5.pdfIn PDF document text
    • https://gafirupi.weebly.com/uploads/1/3/1/3/131384721/40ebdfcd0f9.pdfIn PDF document text
    • https://kuvikopar.weebly.com/uploads/1/3/4/8/134870245/8737397.pdfIn PDF document text
    • http://idealica-co.site/avant_browser_for_mac_free6g85u.pdfIn PDF document text
    • http://artyom.guru/gibemezabupajebekajisasux6zu3.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_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 5828 bytes
SHA-256: 260aae4952e7626dec30475c903828910bfd09bb58acde9cc54051eb05282ce4
font_01_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 11124 bytes
SHA-256: fd0b0d30e8cbe6c5ea2006dac24e1550973531b8e11a1fd9f1ff7590afcea62d

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