Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ebad43f71a6f1a…

MALICIOUS

PDF

54.0 KB Created: 2021-09-19 07:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6c59462414041beed258e6aa11822396 SHA-1: 728c537ac389ef85bba16f7f77d8e8bc3b1246d7 SHA-256: 36ebad43f71a6f1afbcfffeab4210828ed3eeadbd2af3ddd004b7eb498957325
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. The document structure and URL patterns suggest it functions as a link farm on disposable hosting, likely leading to phishing or malware download sites. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6708

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 53 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://garglob.ru/uplcv?utm_term=trigonal+bipyramidal+angle+degree PDF link annotation
    • http://daithanhnam.com/upload/files/46008827496.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/ronimaxiwererareguv.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/vukedog.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/30394188283.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210918012759.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/girepepepipijep.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/29337939242.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/vukogavagifun.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/19007146998.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090213371714.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/48186762296.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/65021195123.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/66368160903.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/69770897924.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/60359035110.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/71771057496.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/xudopezizire.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4250b5fckr11hhr7egttfap5db/86082717847.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/jimakaropumagaj.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/36794963720.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/xakonuwi.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/todanujirawoviluril.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/12903768920.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908154950196208.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/7849330349.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/wajedofegupedononabon.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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