Malicious PDF — malware analysis report

Static analysis result for SHA-256 24166f3558dfea52…

MALICIOUS

PDF

74.8 KB Created: 2021-10-18 02:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5527588d6e7cacc7118a4f4201f49a25 SHA-1: 56a69a52abc1b7fca6e7ddd91e51099dcff98b61 SHA-256: 24166f3558dfea5235980d1e47575770c1007256ee1cdb9abd73282cf9212bd7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the presence of external links suggests the document is designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6301

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://coretry.ru/uplcv?utm_term=how+to+breed+a+donkey+and+horse+in+minecraft PDF link annotation
    • http://sooclose.eu/upload/File/muzadefevov.pdfIn PDF document text
    • http://webursitet.org/Files/file/varofefasivifo.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/55150934208.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/7974356102.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210911120208148501u8c3mpugy7wi.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/69629507595.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/tijunutegof.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/24180712539.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/jaxefu.pdfIn PDF document text
    • http://hzhuacui.com/images/upload/File/18457652238.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/76385323094.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/butuvikadubujozudub.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/79211579390.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/vazomovopugitalewimugef.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/46510050668.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/kezomawuwuvopafixi.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/judogibo.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109090249004920.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/77597011391.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/60542016811.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/575880423.pdfIn 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_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 11120 bytes
SHA-256: e3d83324b0280b1e3271a4ab5e6febf237f164510a88ece3c2e39afd40ea55f4
font_02_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 17656 bytes
SHA-256: e187d964f63922e7e2de6bcbce2d76c084c6b317f3f04273cc4358c1539810f8

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