Malicious PDF — malware analysis report

Static analysis result for SHA-256 db653a10cc391baa…

MALICIOUS

PDF

83.3 KB Created: 2021-02-26 23:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7c925c21bbeb61774baaa50479661db4 SHA-1: fd560113b3b8f660a1a084d368c53d60fad43708 SHA-256: db653a10cc391baa2e04614542f5f856c518b75d203b1361c1805d965e0f4327
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically disguised as a search result for 'Linear algebra and its applications 4th edition David Lay'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further compromise.

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://mezovuduw.ru/strik?utm_term=linear+algebra+and+its+applications+4th+edition+david+lay PDF link annotation
    • http://tamakar.xyz/32369075701i4q6f.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/forax.pdfIn PDF document text
    • http://bestsaleshopin.xyz/10632594511qwfk3.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/sumitifipofebunifjs5yy.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/nX2jghc/tusidazerajekef.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/7jir3b9/65180055862.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/e0ee741e.pdfIn PDF document text
    • http://welojesuvarari.iblogger.org/grand_staircase_escalante_national_monument_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jugikan.epizy.com/foundry_process_qualification_guidelines.pdfIn PDF document text
    • http://godizob.rf.gd/67587003717.pdfIn PDF document text
    • http://kigitom.epizy.com/59401729772.pdfIn PDF document text
    • http://makowadoka.epizy.com/editable_rent_receipt_template.pdfIn PDF document text
    • http://wudafozejuniv.rf.gd/kawakami_persona_5_gift_guide.pdfIn PDF document text
    • http://dawifugoxumevej.rf.gd/vitamix_5300_blender_vs_e320.pdfIn PDF document text
    • http://diwesetudu.epizy.com/how_do_you_describe_a_smell.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 5664 bytes
SHA-256: 47b1cca8572171de2e36fb21a6c851cbfd1416ac3c5413a509fc3674aafc328a
font_01_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 11144 bytes
SHA-256: 1aaba962580e6e599b8b06aaee1697c5538c17eb0cb3f806ceb20ff18aaf0ed9
font_02_sfnt_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 16084 bytes
SHA-256: 7bb111f4ce79ba48502a837b83d40e55cd246b86015b702aadb01736ca16f5d3

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