Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0afc31fe39d5c8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 11:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7ef72e297072878fafa4627f03483d7 SHA-1: b54f5c7fd20507982bd78fc96c033d9424ebfddd SHA-256: ad0afc31fe39d5c8ce9c5746dad04e1e71f0f70bf6c74ed7f9f2ef3f11d5461b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics, including ML classification and ClamAV, as malicious phishing content. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of 'utm_term' parameters in some URLs indicates tracking or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://medvor.ru/uplcv?utm_term=how+to+share+all+contacts+from+one+phone+to+another PDF link annotation
    • http://cowmoo.org/ckfinder/userfiles/files/14413593942.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/76826528817.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/70828822819.pdfIn PDF document text
    • http://iphysiology.ru/upload/66109318447.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/58494610450.pdfIn PDF document text
    • http://timebymtm.com/upload/files/5898150122.pdfIn PDF document text
    • https://auto826.com/uploads/files/84851986344.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/dotelanamokidojikafikaj.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/ninivunilarelojuwotiso.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/33856429466.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/pezuxoketosusezozavogu.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/85312357249.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161341e6da0729---32513628642.pdfIn PDF document text
    • https://olterus.net/contents/files/72419900645.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/34710820490.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/pizujivimijisoxu.pdfIn PDF document text
    • https://beaszemin.com/files/wetudisawurejoxawor.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8ad8864b---66893516896.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/janewidilanofurubaxa.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/goribir.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/38570466121.pdfIn PDF document text
    • https://lecachet.fr/docs/files/vifijepuzezetinubojizitiz.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/66234428002.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/ravakaduwakezuxafafomar.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/wuwodalavogud.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/70232839096.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/kogunefitegalibasexosuvab.pdfIn PDF document text
    • 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_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 10728 bytes
SHA-256: 91a8fc5f813fc244422bd850d85a2af9958240f5ee326438a0eab425e3363de9
font_02_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 17140 bytes
SHA-256: 2480e76de188e2000102576164358e38ea40899bf1924a1d5bfbe848dd19e121