Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe9506d1872daa6…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 05:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b1921debcb58dd863ee32401da6bb4c SHA-1: d9346d8c068acd5fd8a92008e61ef1c5a30749ae SHA-256: cbe9506d1872daa6e6c2797046e50ebf096fcf6faf328249d968122c8d2fd4a8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content is designed to trick users into installing a browser extension or update. The embedded URLs, such as 'https://jacksth.ru/strik?utm_term=https+%252F%252Fwww.wordpress.org+login%252Fwp-admin', likely serve as the initial point of contact for this social engineering attack, potentially leading to credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jacksth.ru/strik?utm_term=https+%252F%252Fwww.wordpress.org+login%252Fwp-admin
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/8019668.pdf
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5ff52772b5b44.pdf
    • https://cdn.sqhk.co/fokofike/gck3li3/19059110854.pdf
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/biwagapizababit.pdf
    • http://igcopyrightclient.com/lekogewogobibaz4iws5.pdf
    • https://cdn-cms.f-static.net/uploads/4403266/normal_603ee00b9a343.pdf
    • https://cdn.sqhk.co/fixefalid/izhhQjj/9685158541.pdf
    • http://muzoc.xyz/webuzekoz7fdt3.pdf
    • https://cdn.sqhk.co/nufesewepi/ighfEif/nidatezinefulubevinedo.pdf
    • http://qrastenmap.online/10090621084vj3kq.pdf
    • https://cdn-cms.f-static.net/uploads/4464539/normal_600ccef08fa63.pdf
    • http://fizasibako.22web.org/how_to_buy_stocks_canada_td.pdf
    • http://usejus.pro/121456535029nzpe.pdf
    • http://pufaxokijajijev.22web.org/44558764345.pdf
    • http://legiontry.online/bank_of_america_merrill_lynch_corporate_card_pinuugiq.pdf
    • http://netzamka.ru/pdf_nclex_review_questionskfjxz.pdf
    • https://static.s123-cdn-static.com/uploads/4467285/normal_6007111a7453a.pdf
    • http://agent-ritual495.online/676480904316getv.pdf
    • https://roxupabepali.weebly.com/uploads/1/3/4/6/134611875/c7f5752bd3.pdf
    • http://obmenkalnr.online/what_size_wire_and_breaker_for_lincoln_225_arc_welder7lrww.pdf
    • http://kigurumi.org/rawerapabibufijokemenotebrp4zm.pdf
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/mikejodolo_masejat.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/9397074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e476.bin
bc45b8586bb1a1beeaed15264bcda1c8d328194d33d24bd7e3db5b483aa57272		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 5432 bytes
font_01_sfnt_off0000f6f7.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 1800 bytes
font_02_sfnt_off0000ff84.bin
5c0d93cb048c72514de31138acf7aeed0a86fc8152640f8dd269f3efc1704f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 12888 bytes

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