Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d2c70c4cdc15b7…

MALICIOUS

PDF

71.7 KB Created: 2021-09-23 02:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e133762c1a899839769c0fa01fc196b4 SHA-1: 9df8bcae09980f170a4dce269f61619dcc65a15b SHA-256: a8d2c70c4cdc15b78dc3e545d2851e8b33dc74a0c07d480972b2cd863a22afc7
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of distinct hosts suggest a malicious intent, likely for phishing or distributing further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=telegram+android+client PDF link annotation
    • http://iccjsc.vn/images/uploads/files/13970859038.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/tilositewesilidarasemu.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/talarizutiruvalokivako.pdfIn PDF document text
    • http://qdjshg.com/files/file/xepefuzewuwofiwirozus.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/15633563562.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910083004988796.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tedigowetijixif.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/83e0182ad161b42f8933086a92203ef2/ketasokukodalakowojus.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc96b5b45---2314285300.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/65724753947.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/76303762672.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/megurugiju.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/21578307217.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/87583249956.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/gubaf.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/jokulexe.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/tifufoned.pdfIn PDF document text
    • https://onlinendttraining.net/files/doputeku.pdfIn PDF document text
    • https://yifff.se/userfiles/file/sufojadebakomadu.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/90079558945.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/gabixuranefab.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/6820491210.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_off0000b7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DF 10508 bytes
SHA-256: c1f245c07352bec92f8a92553ff51c239238a6e7aab5dfcd086e700a064567bd
font_01_sfnt_off0000cf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 16088 bytes
SHA-256: d691db407a3459e3096261dfb6f88b844efa7056d47cd93541925d710d657c3e
font_02_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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