Malicious PDF — malware analysis report

Static analysis result for SHA-256 2467b4d3312aa2b9…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 13:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4bb088e312a0f62474db6def10f6cbf8 SHA-1: 0c80464797312fe638b8d72a8a09935283aff148 SHA-256: 2467b4d3312aa2b94274869b709b4c71453fef06a8b92d43586334f3807b048d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a lure or redirector. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=useful+codes+for+android+phones PDF link annotation
    • http://cinebuzz.be/uploads/userfiles/files/lenolufuvo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/34066351305.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/18979416964.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/timosudodosuxi.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/luvagajavumavagexexixa.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/dokamuxafefiguxutebato.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322d151ac65---lirudazilodibekunafo.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109020936481719.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/dawewoneb.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/tojerunutegoketofaw.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/rijurivumoxete.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/97159403527.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/86703886132.pdfIn PDF document text
    • http://mopron.ru/upload/files/xofisawumawikow.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/18975668117.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/19190132473.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/ruvamonuvirojizuzufe.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/53658c640c4556ee61b72f0f4022740c/guwore.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/xuxejafivez.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/tudidaganarinetidodojuk.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/44281313434.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/pupufuvajuwofesexezijava.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_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 18020 bytes
SHA-256: fc2e64d9d887ca2e10f79cf61452dfef1ea8db796fad6debbd6625dfd1787ca6
font_01_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 10724 bytes
SHA-256: 48f0688f7a472f45598bd047341e44f2a6bbbfd2157d2057cd053d0892572fd7

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