Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d29f4c84763415e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 12:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 445ba0187eb5c4f4f666a206aa47fd76 SHA-1: 48912e5f699b94e7dde8a16f289e186567128530 SHA-256: 8d29f4c84763415e50852f559a2aef96539721bd6c6686292a40f78814702678
166 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social-engineering tactic, specifically a browser extension or update installation lure, to deceive users. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic firing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to malicious content or downloads, potentially exploiting vulnerabilities or delivering further malware. The ClamAV detection further confirms its malicious nature.

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://pypconsultores.mx/userfiles/file/95108208303.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d455a8f86---40376207711.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/tesexak.pdfIn PDF document text
    • http://palami.by/images/file/fupilekozazaw.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/97658938745.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/xavifepoladad.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/90667192590.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/nezodegisalovub.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/pemufobexenoge.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/fipakomesurugajilo.pdfIn PDF document text
    • http://guchen.ru/d/files/purubexuxele.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/89537198718.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/bidamifajejesemasir.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109060509265159.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/genanupaxanurosow.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/jesasowule.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/xenepagikimonu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/34184080104.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/xolulifikemez.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/jumujilapidexaxutat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=personal+dns+filter+apkPDF link annotation
    • 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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10584 bytes
SHA-256: a69fb9a894b8be7c0353c6cd7eb227bca3cfc2d9c8732f4309ef5584b2adeac9
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 18768 bytes
SHA-256: f6c993e1da19a5a822008e230698e24c617742fd293d175b6ff0cecb474bc0f9
font_02_sfnt_off00011fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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