Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea0b6a39042af2f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 18:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9732da54dd1c7ea8ad4be21e2bb234f1 SHA-1: ba66cd79f9854f48efffecfa29c024db12961e09 SHA-256: 1ea0b6a39042af2fda8509db7847a7d0040252a39eb09a34562dce2c3421bcae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, embedding numerous URLs, with the primary goal of directing users to potentially malicious external sites. The presence of many distinct hosts and UTM parameters suggests an attempt to obscure the true destination or to track user interactions for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ip-malkov.ru/uploads/files/48075218768.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971c169541---falukexemomipumosili.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/matolisagex.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/85563331954.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/56629732217.pdfIn PDF document text
    • http://beta-rc.com/upload/files/zewugusolujakorofafekevat.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/vewuvubodizidawowexaxep.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/4967635071.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312969887dc---32284230284.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/nofaredarumadag.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/konisemuloletokokapa.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/zababepumimel.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/mememolami.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/92341226168.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/nobipovedubu.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/sutaji.pdfIn PDF document text
    • http://yuli-china.ru/d/files/62797273954.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/zidoliketop.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/pijovijuborudukan.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/poxeruwuj.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/poxujijuwibanapub.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/sowavubuguxi.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/37064098235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gravity+movie+online+play+freePDF 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_off0000b3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B4 10572 bytes
SHA-256: 75d34402ff5564ea503d71c9c8de52ca67d65e7da920d90ab5a988cb2e74b2eb
font_01_sfnt_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 16512 bytes
SHA-256: a6a0e40a04ec8c8a740502a309d67ef2bf7c77a01cf23e26ce0ffd796f821f1b