Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b732eb4350395e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 16:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6259bc894c67c7210e9240c907ed732 SHA-1: dae7a693375f4d32abebd3f48221f8a78c767396 SHA-256: 92b732eb4350395e44f7d7e8e0e7fd2f21d3fdc62edb2ed8eef5f41b9c1a6f9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to distribute malware or conduct phishing attacks through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=best+emulator+for+pc+windows+7+32+bit PDF link annotation
    • http://phongthuydotho.vn/upload/files/99853193317.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/57236143799.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/45273720231.pdfIn PDF document text
    • http://cascad-trans.ru/files/23972379332.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/76493323126.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210912_145700.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/nubupiwazo.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210916055904.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/48184660075.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/nunivasujixodobisirimipa.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/nivopolojo.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/lajalepaw.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jofixutesijul.pdfIn PDF document text
    • https://redac.ch/upload/lemupor.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b2438855---daxoxovozonajifatugapego.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161400f4e8f151---89794645377.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/polepijafiwale.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/67428349340.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///kilodidukavezimoxamezi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/rijasexinodode.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/widawu.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/73554405278.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/91424177143.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/dixijalonalofeli.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://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_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 16472 bytes
SHA-256: 9f309f2d6fb2dc8974cb2fe2ba7ea36dcd5c2a86469af93b030c679e1511c7ce
font_02_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 11500 bytes
SHA-256: 2b8719cd12827ce8c20f2e41bcb418b327c735b7a3bc31fc2aac0c13f4398af8