Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e36ee5424291d3c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 05:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3234eb57610ccdb14aa9858c00ea685 SHA-1: 889a8627b6daa61a67d01a4ac8bd6e3803793f3d SHA-256: 9e36ee5424291d3cd14ffff7bba771871b433667cea0616d7de5c0250e1878d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these external links, which in turn host more PDF files, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://pixel-pro.ru/upload/file/vabubos.pdf In PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/6107600385.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/65330139836.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/korelanabusasexevuxet.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/34883513531.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/xopifezejenutabixe.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/13644095190.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/xofunumap.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472af8552c8---rukano.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/tutineku.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/86305332484.pdfIn PDF document text
    • https://777mto.info/contents/files/50253432557.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/34927728197.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/winuraweguverogikogerozoz.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/53624738475.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/nixotijiponemupad.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/gebutabodixobuduvupas.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/35205010940.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/28be1b0678bceb6e9c6ef32ee8a85c00/bonexuruk.pdfIn PDF document text
    • https://pindimana.in/uploads/file/likiw.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902045238176007.pdfIn PDF document text
    • http://wernitznigg.at/files/55371349490.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/kinelidopogafadugodo.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/liwupimerozixasurusunoxun.pdfIn PDF document text
    • http://packturf.fr/files/bexaxufitowizovinar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+turn+off+message+blocking+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 11228 bytes
SHA-256: 93b16c8d14a9fa7d5acbf5a6e331c710360c8f7ff2fa7792608de16647b2031a
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 18372 bytes
SHA-256: 6a0d3efc40761d9c2c4b3353b27a739247534ed054588e9cb191936f6aad75ed
font_02_sfnt_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1