Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ac689545c9acba…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 01:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93a308bfb6ce52ec297591d20162c127 SHA-1: b5ed3494eba7507466598487a014d2c984cf4167 SHA-256: 25ac689545c9acba2956ba9c1147a28260507c7707fee0b1b50b001689b52927
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external sites, as indicated by the numerous external URIs found, including a suspicious URL with a UTM term. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=android+18+sexy+cosplay PDF link annotation
    • https://davaocarrental.com/images/file/21501921871.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210903_070110.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/felaf.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48e52f151---lebimutinuku.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/gubaf.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/mivojotevefelaluke.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/13183242105.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/26226896681.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210904_70F6D396F65288EA.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/tamufoxejeg.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e3e1ngi4go1gd4crk1jgu029r8/vunuxadubobinajirud.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/gewizalobunebuwozux.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/mapedakibumukup.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/tivojejeguladimejil.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109020824386598.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/rifafijazokagakevujo.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/xogebex.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/jobozobozewasotibez.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/25593102861.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/teziwabidowesutazudodob.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_off0000ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 19148 bytes
SHA-256: 7609d1448ec575be7f4988a38b3748d646b5647f750ba57197d3f561416b0f70
font_02_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 10868 bytes
SHA-256: 399f46e9d7cbe8046484785d0faede2210e1a0bddd1bbe8e12a03f77025ebb56

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