Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f76b6047bd8f3f1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 20:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3659ae18c990ab0d8bf08dfde61df7d0 SHA-1: 5f0649ea062539893c12387a12ff1907c8f5000c SHA-256: 4f76b6047bd8f3f17cee20b8fab5393b0bdb5518d30163ecbf1d9c80f032338c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=slope+unblocked+chrome+web+store PDF link annotation
    • https://limpiezasinasel.com/userfiles/files/gizijiferuwup.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/37667589642.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613375ff38ccf---79724530704.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/70639444127.pdfIn PDF document text
    • http://prosquash.by/data/fivulum.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/15266342544.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/41004880768.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/53f5139a9d7d289d502cb0c2ca88b6c5/jebepavikaluxaxejevopel.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/9405996223.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/zajifatipasejabejirasa.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/1739441184.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/dezabudap.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/riletaba.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/85093134824.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/77849804166.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/16141643672.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/71114933645.pdfIn PDF document text
    • http://findusafranchise.com/files/files/27965334051.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/dimixej.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/wuzejafebiwu.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/31626519792.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/17136688268.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/24124172147.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912091249.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/patukinomitupedubivi.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_off0000c09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09E 18936 bytes
SHA-256: bc6722535bba9bf1352d60076f9ad5c38d5b62e61455c5aa87a17dd616336f35
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 11016 bytes
SHA-256: 4dd7b99a5ae1c0d45f21f745eadbe24559f67f076dd1e46a20f3e88e6be678a6

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