Malicious PDF — malware analysis report

Static analysis result for SHA-256 17388debf143df82…

MALICIOUS

PDF

70.2 KB Created: 2021-09-11 22:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b99c7e2a51327eb4231f36847f932c5 SHA-1: 605852a59a9b57dbde3089118038416b4456187e SHA-256: 17388debf143df8270e9a80a88ee312a5fa7fc8b960398aaf6312e19d2a6996f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and are associated with link farms. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6634

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=crack+rar+password+android PDF link annotation
    • https://bimore.vn/webroot/img/files/18330083112.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/2934983893.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/88170793374.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/476d4fa8eee88799be468cd84eab7fbf/fogurodo.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/vasomiko.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/wubuti.pdfIn PDF document text
    • https://aokman-drive.com/d/files/nimolemezagepofixijo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9d9e5d0b---lulogugefepebod.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/13913015377.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/gopozinijitivabifirefam.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/vawej.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/lekimewasewitufedip.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/76727978148.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/tepumasibasavud.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/41131932264.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/dijojepafurefixano.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/60922298362.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/filowe.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/jevukabijuxuv.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///kefutumagazovereji.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/59696902227.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/54468616679.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/jovikaxifax.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_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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