Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1891a8ce59c64d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 15:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ebbaaa285d45d1b4c30de446e595857f SHA-1: c62fa60cff01e09457654711ced607dc3fbb07c1 SHA-256: aa1891a8ce59c64dccf6693177dd30bd5ea81675932848cea01a3b42c10890ef
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using numerous links on disposable hosting to obscure the malicious intent. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5648

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://wastran.ru/uplcv?utm_term=the+basics+of+hacking+and+penetration+testing PDF link annotation
    • http://panteres.com/files/files/78255091456.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/munetolabavo.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/poxidujakefaxuwe.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/menopufoduzubitunefigeta.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/jisakivuvoliz.pdfIn PDF document text
    • http://corkpotters.com/images/51121209356.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/84757512709.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/94834878846.pdfIn PDF document text
    • https://grancom.by/upload/docs/5670765177.pdfIn PDF document text
    • http://grossbuch.com/upload/file/kejidelim.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/24973907407.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/8870870012.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/23fc3cf5a7f21947d01fefa0933dcb81/boregutobama.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/30734533232.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/4175148607.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xopez.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/nisifowajasudigupan.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/gojebimonunitijaselarug.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/finisojarafoxawakuzi.pdfIn PDF document text
    • https://novsport.com/content/File/41700441414.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/putidotuzizoleg.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/36026538486.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/tonimurozojuvezewamuge.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_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 11048 bytes
SHA-256: 6dd798ddef558a706d82e07d0b244e0411e368b1a18d649f6cfa9698af8e0dc2

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