Malicious PDF — malware analysis report

Static analysis result for SHA-256 3252da4a05c13add…

MALICIOUS

PDF

82.4 KB Created: 2021-03-28 01:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f063c510f56487683d24639ca601674 SHA-1: c8dae3d3d401c1bd25bf0b26e46dfb056e68eea9 SHA-256: 3252da4a05c13add406aa464026474cf3f2e658ec234818ec91658b8aec873eb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to host many links, likely for SEO manipulation or to distribute malware through seemingly legitimate-looking documents.

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://dafemum.ru/award?keyword=accounting+and+finance+for+managers+book+pdf+bharathiar+university
    • https://static.s123-cdn-static.com/uploads/4381980/normal_6002b44be7e44.pdf
    • http://xitawefavam.medianewsonline.com/8358795843.pdf
    • http://memimusisat.getenjoyment.net/10671358644.pdf
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fe50c0a3de66.pdf
    • http://rekabiwuxu.22web.org/financial_statement_example_of_balance_sheet.pdf
    • http://vuzuwul.getenjoyment.net/sketchup_free_download_crack_2014.pdf
    • http://roxosavizas.22web.org/mathrubhumi_calendar_2020_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_2ba50a7264304a679c831e11fbfd8bfa.pdf?index=true
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_f48b7dfc118c4a2aa0ed4cac7342936a.pdf?index=true
    • https://4ebe1e6a-8a13-4145-b3c2-d2faed65f423.filesusr.com/ugd/a67e73_9f2608ab4cbd4d4b8f6198d9fd7ad0f0.pdf?index=true
    • http://mabobasator.epizy.com/how_much_sodium_in_taco_bell_chicken_soft_taco.pdf
    • https://uploads.strikinglycdn.com/files/8cc701c8-e8a2-47b6-8819-bd32bc06e57c/atlas_copco_screw_compressor_oil_grade.pdf
    • http://sonifikidukaxiz.epizy.com/82015355162.pdf
    • http://terakezakoju.epizy.com/72874354741.pdf
    • http://doxokalisawe.myartsonline.com/receptive_and_productive_skills_of_english.pdf
    • https://uploads.strikinglycdn.com/files/33f93302-55e8-4691-87db-21f99404b346/91084985101.pdf
    • http://fukekixejup.epizy.com/biological_diversity.pdf
    • https://uploads.strikinglycdn.com/files/29cc6088-30d5-484f-8919-65b6de5e559f/koterejexojoled.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100bb.bin
da2cdff6859bb844a4d3f5944e35671906958d6f884b89469d1f746a81db057b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 5892 bytes
font_01_sfnt_off000114af.bin
2c66a610d043bfe6eb345ff5209f5cbff2bb8e5a1e45447e639f6d06388f2ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 11808 bytes

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