Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a2966a587c737a…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 11:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd7ed5b0f74f98920f845b638524552b SHA-1: 2c279eb711bf3ea018fefec392ebf75b57cdbe3f SHA-256: 84a2966a587c737a824b11943c59f65b9c83c9988a738f2f638b6088ab0930b4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to PDF documents, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=signs+and+symptoms+of+ebola+virus+pdf
    • https://cdn.sqhk.co/dubutemaruxu/jbhhjii/67974191965.pdf
    • https://cdn.sqhk.co/fabetojowuje/Viegiia/vemasopolud.pdf
    • https://static.s123-cdn-static.com/uploads/4415937/normal_6007a7d90cfa3.pdf
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fc82664e9b07.pdf
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5ffd1f5d6df3a.pdf
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5febcd963e8c6.pdf
    • https://cdn-cms.f-static.net/uploads/4469374/normal_6035719030f7b.pdf
    • http://nanolenka.xyz/780479854189ja5p.pdf
    • http://zerkalo-fugicar.website/aniquilacion_libro_compraroscw6.pdf
    • http://wejesigozolireb.getenjoyment.net/bunn_slush_machine_parts.pdf
    • http://sadinexiwa.mygamesonline.org/pafizi.pdf
    • https://tazusovekofuwaj.weebly.com/uploads/1/3/5/9/135969448/duvuguwugedenaje.pdf
    • http://mukinumatonewo.getenjoyment.net/gezonijoza.pdf
    • https://galojonebe.weebly.com/uploads/1/3/4/3/134353990/vugodorotin.pdf
    • http://boribonabone.mypressonline.com/our_god_is_an_awesome_god_chords.pdf
    • https://cdn.sqhk.co/bikegola/gcShg5H/fuzudexebitaka.pdf
    • https://sorebupewuf.weebly.com/uploads/1/3/4/4/134447244/3365774.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jubogaju.atwebpages.com/loxokuxuduxirasodoli.pdf
    • http://bigapenegig.atwebpages.com/briggs_and_stratton_675_series_pressure_washer_carburetor.pdf
    • http://tososite.onlinewebshop.net/guronererokogexidoxazib.pdf
    • http://lawiferow.myartsonline.com/46728914644.pdf
    • http://xijejuvi.myartsonline.com/xetogatolawuvojorerefuti.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_off0000f4ae.bin
92f2fc27c4be0d70eab88c245a359634f955d1d4a97dafdc930929cb95bf82a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 5768 bytes
font_01_sfnt_off00010846.bin
e4ea4b690a6e04a3d811b6f497fa72fede64166d01a0728321c4fc1814d6aabe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 10520 bytes

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