Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c32f729aff116d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 21:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5c1bf34ee51e1d3b0179e80b86c345d3 SHA-1: 0c82372df39db86030da2da7101fee82e4614c08 SHA-256: c6c32f729aff116d850a106c77a1cce991f20b6fe8937bb444bbdda5fd7e7227
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=structure+of+selaginella PDF link annotation
    • https://spcinternational.in/ckfinder/userfiles/files/55909160216.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/70808105811.pdfIn PDF document text
    • http://citty.org/images/uploads/file/kipezipaxowarupupag.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/todokekelunutibojafis.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/44468342107.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec49458c18---niguzizexalisenewopa.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/46096638900.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/36901927547.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/36203410224.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/raduxenus.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d01881559---silifoxurumevabupani.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/jevotebojulo.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/pebozejomulazaradijulo.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/sadafajeliparebelod.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/17283372532.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/54445326710.pdfIn PDF document text
    • http://glassick.com/userfiles/file/zimupusuveloxexivesinu.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/86764405518.pdfIn PDF document text
    • http://hidramaco.com/files/files/gevikelarevavamitanine.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/jamupuri.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/80139516548.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/movomowaxezagugusin.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_off0000ce79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 10688 bytes
SHA-256: 4f9eb6f2753fefcda4eb0497ec7d42bff27a3b8f0c6529c1ad579b30226757dd
font_02_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 16580 bytes
SHA-256: aabab16b5b59cc3ddd7f4c6ea8838ad2fcf10c606be5e1468d8175151d1cc009

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