Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac3642565acced4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 03:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1974456322d4b0303d15eb775ae82572 SHA-1: c7e005f3533c4fe0cdba5fb2b827a8413700b30a SHA-256: 8ac3642565acced4e745a5c48c436e580ab310ca546c80eae2ac6ab05797c285
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8531

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=structure+of+glycogen+molecule PDF link annotation
    • https://pmcp-avac.com/files/upload-ckfinder/files/80412258909.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/sodub.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/51838840771.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/zuwurene.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/45195545962.pdfIn PDF document text
    • https://bselink.com/userfiles/file/butili.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091401355173499.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/rifaw.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/88565359646.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/80411910817.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/kapetuwojadik.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce0d5d29e06acfc76491186777f4c73c/88551475072.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/55472164809.pdfIn PDF document text
    • http://cbstav.cz/file/namasesatepenup.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210902053854.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/10636804249.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/34280300710.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba55b395a---9230426141.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/gixasopixijinakubi.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/31220145821.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/zujekejipo.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/xatemizixutes.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 10544 bytes
SHA-256: 252de66864b4279b2c9790e1054b279d8a0800010d956d487c8d49d6275a9b83

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