Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acdc483b817077e…

MALICIOUS

PDF

75.5 KB Created: 2021-05-11 16:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff7a42631d49a5969a754b990120c024 SHA-1: 76fa0df9b95e63e54d8c24cbb01d11b8a041c2c2 SHA-256: 0acdc483b817077e20330b1cb4601199fdaf1976117d4f7da584c5902d3d546f
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains multiple embedded URLs, with the primary IOC being a link to 'vilenefex.ru'. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF format strongly suggest an attempt to redirect the user to a malicious site, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=all+american+canner+921+in+stock
    • http://pakawuwujawo.getenjoyment.net/nusosadixutuvaxube.pdf
    • https://cdn.sqhk.co/sufajezugi/eqEwohc/93139647352.pdf
    • https://cdn-cms.f-static.net/uploads/4403818/normal_602c8d27df58e.pdf
    • http://zexaribamemavi.sportsontheweb.net/wing_chun_fighting_style.pdf
    • https://cdn.sqhk.co/pemoxeriko/jiihemY/airplane_mode_movie_netflix_actors.pdf
    • http://bixekakazozerol.mywebcommunity.org/5976993287.pdf
    • http://gojevomarokabe.getenjoyment.net/57716730872.pdf
    • https://cdn-cms.f-static.net/uploads/4468837/normal_605f49a48d4db.pdf
    • http://pipavinekiga.mywebcommunity.org/52383714938.pdf
    • https://static.s123-cdn-static.com/uploads/4386834/normal_5fc56b60d78a0.pdf
    • https://cdn-cms.f-static.net/uploads/4445321/normal_6065ab60622ae.pdf
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5fde643caf15b.pdf
    • https://cdn-cms.f-static.net/uploads/4387582/normal_602ea37b39a4a.pdf
    • https://cdn-cms.f-static.net/uploads/4446502/normal_5fda09e3a2f87.pdf
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5fedf985d8a72.pdf
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fe1d0281ac72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_33fd857f69dd4798a8c54092791e7c5e.pdf?index=true
    • https://s3.amazonaws.com/sakaburepagase/how_he_loves_us_john_mark_mcmillan_live.pdf
    • https://s3.amazonaws.com/makumapikeze/kufimamojurag.pdf
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_7d1546275896436aa3a0e5455128c275.pdf?index=true
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_604eadcdda3d438a8c69c9e01552417a.pdf?index=true
    • https://s3.amazonaws.com/wujapu/9117971977.pdf
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_0ae62792ce0943779553b04f10223809.pdf?index=true
    • https://s3.amazonaws.com/xakusineba/digital_integrated_circuits_textbook.pdf
    • https://s3.amazonaws.com/minegikukovel/13452302928.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_off0000e990.bin
5623251184927b0f37edde490e76f3972de915d563577ce1b1ce954f342b59d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 5340 bytes
font_01_sfnt_off0000fba6.bin
25915c383e8b4af61915956bf71df73189b86bd5f5bb9fc8cd7832a0240b1e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10760 bytes

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