Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e0e13e0c0fbbc3…

MALICIOUS

PDF

67.3 KB Created: 2021-10-02 22:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8c9affd67009a1211d89b742ff7835f6 SHA-1: bc7fa93341eebcf57a295314882702eb40edc764 SHA-256: 23e0e13e0c0fbbc347859019a120c9d82c97fc6c855f4d9da340e22b993641a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The PDF structure and the presence of external URIs suggest an attempt to lead the user to malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=driving+quest+answers PDF link annotation
    • http://tischlerei-schlusche.de/sites/default/files/file/tejumagutarib.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/lipulotururififex.pdfIn PDF document text
    • http://storemisr.com/uploads/files/xemuporudaloraw.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/nomibenakupad.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c925b65b6a---83515914433.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/85021307151.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/21606969297.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/kopefek.pdfIn PDF document text
    • https://lorus.rs/files/17819634771.pdfIn PDF document text
    • http://reichspfarrer.sk/file/93668086552.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/18689976698.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/zepawuvilumawudo.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/dedowumefesobarunabulan.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/piriwaxanukuru.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/wigimerozumefejarerirom.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/41850751316.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/20767758547.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/62278040345.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/sibuvivuvofaj.pdfIn PDF document text
    • http://partnercable.com/files/6576758807.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/869acd1d60b8aee71b2aec1b4d9142c9/tatinutejomovujapos.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_off0000aac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC5 10516 bytes
SHA-256: bf9f5e8852205bd431c87d6d5d7790ea088f8bec52c92b0cd98c0fe12b9d4c08
font_01_sfnt_off0000c29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29F 14920 bytes
SHA-256: a7677fbe578491af495b51264f5a84f461ebe0c1e4b1a7fce8b45687b7ed3eb4
font_02_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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