Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec758183223e9e0…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 21:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83c586bbe45893fc8e01c95fe9b90340 SHA-1: 4d86af8b714ab4f1deb8c220860bd0aef7f93d2e SHA-256: fec758183223e9e05e86ded41ca7dc18a7c33af5ebcc7776533a5032a10caf00
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware delivery lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common tactic for credential harvesting or malware deployment. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for further exploitation or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://inwebjor.ru/uplcv?utm_term=new+chrome+android PDF link annotation
    • https://navoloki.mebel18.com/uploads/files/xanimeseninugef.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/52464565147.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140d5760efda---pizunaj.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/53102031609.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/15881114676.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/wuxorakeras.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/fikufowosamubisege.pdfIn PDF document text
    • http://airmon.hu/images/files/86581226569.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/diwutoresevirowoxarigi.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/kenadudagidofozed.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/54148613622.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/26599398404.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/bemetumokulelejuze.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/warax.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/puvixel.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/91145229291.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/98310896542.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/kimeze.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b6231987e914eb1c8634e9dbfc31805e/nekatijatisoxukiw.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/ligixuvudafud.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_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 17960 bytes
SHA-256: 65b11f1dec2c92f41cbe36869c697ddcfe8acdbc48e5819ecc4f0f8086e4f16e
font_02_sfnt_off00013668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13668 10388 bytes
SHA-256: 5a60f2e63a86d6a6b2ffd57fca9c03e63d98dcb6bcd42e0c125688ba21168182

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