Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cda87eeeadc22cc…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 23:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3bff7407818ac13a8e7fb18695b61617 SHA-1: e9241e7642640bc673a31fbef7b7e8d37c8bb268 SHA-256: 2cda87eeeadc22cc18b6398e996b771ff0d1e52baaf8f7111a94e33209193db7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many on disposable hosting and utilizing UTM parameters, strongly suggests a phishing or link-farming attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings point to a malicious PDF designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

Heuristics 4

  • 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
  • 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=go+keyboard+pro PDF link annotation
    • http://saigonford3s.com/uploads/2021-09-07/images/files/16098350412.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/rojunuz.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/95095173606.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/fasegobux.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/biwafajasop.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/jonevamid.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/pajilemimivenirewut.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/gomixoxuzenuremot.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161361bf50be2a---12177444973.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/reratowezizoropine.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/tivalamidiluxemetibopu.pdfIn PDF document text
    • https://braus.uz/images/shared/file/bupidiwudalifufefejokoguf.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/lipebirajejixubanu.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/dezerusifudelefuxiwilewel.pdfIn PDF document text
    • https://campermagazine.tv/public/file/soturedowapojexomosonef.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/bugazodamutowovuj.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/9671932104.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/51833726929.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/35506432989.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379da657c63---39497272988.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613236a6e11ad.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/wetob.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/bitezigudafidaruxuxeroro.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_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 18436 bytes
SHA-256: d511c56c4cf44d24cac2713184de54a3151574e5dd4a3d39e3c37bf7848594af

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