Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfdb75c11e929f5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-22 11:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4683dd744a6becb66dea24fe052b2593 SHA-1: b09c14c85f9fc3e5ece2437d6533ab4ac174677c SHA-256: 4cfdb75c11e929f58395df345553e025bebd89f520d86d2458df1a269da27fb5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm designed to lure users into downloading further malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social-engineering attack aimed at tricking the user into installing unwanted software or browser extensions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://tongchangkj.com/uploadfile/file///2021091419104520.pdf
    • http://annamsaigonlaw.com/upload/files/sakutuliwemutawobunopamo.pdf
    • https://szabolcsipeter.com/userfiles/file/kumipirululumuwatuna.pdf
    • http://advocaatindex.nl/images/uploads/vugowavolupomebawudelepe.pdf
    • https://floridainvestment.cz/files/file/jipibokoxirut.pdf
    • http://miet-boot.ch/images/uploadedimages/file/84475811960.pdf
    • http://cukiernia.eu/upload/files/xaxaxamubejivowiraxuvan.pdf
    • http://www.alborada.es/ckfinder/userfiles/files/wewanewuzis.pdf
    • https://olamare.com/img/uploaded/file/73904709408.pdf
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/lisolakorezeru.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a27c90fd5656724d18f44f13dbd0b092/dafigidofujemak.pdf
    • http://kapsalonvogue.nl/files/file/majodonobinupo.pdf
    • https://cytokin.ca/upload/editor/file/52486098883.pdf
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/zakadogufotunodajub.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/50278317945.pdf
    • https://gedayapi.com/userfiles/file/zalojofuwulugoxoba.pdf
    • http://ajej.pretty-match.com/upload/files/wowixewupofipepomoz.pdf
    • https://cvsc.co/userfiles/file/30344336444.pdf
    • http://c2ctrading.org/cms_upload/files/12292818283.pdf
    • http://ablerexthailand.com/userfiles/files/kevodapovamiwobedaxomun.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8f7d25ed32cf589ab2b492e2b548249b/31668954343.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=xiaomi+tv+chromecast+not+working
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 16792 bytes
font_01_sfnt_off0000e2c4.bin
c57bfd0ddbd295d0a71043d172398c64dd437f10ebe3315f3fcda05b1d039e6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10884 bytes
font_02_sfnt_off0000fbd9.bin
c9f5f08832fac97a62baee6e2b05434def85fb98b80bd17212d3a8d18d56cd67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 18196 bytes

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