Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d4b2e95f84d6ef…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 21:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b3ca8b34c859aa43940a9de570ee702 SHA-1: 0592a60ebd24bce9c7ce207ada8ef782f9ddc3a7 SHA-256: c8d4b2e95f84d6effd441c887ddec8fcc870dea67839da9024727d2bea7dc182
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external domains, many of which host further PDF files. The presence of embedded URLs and the link farm behavior strongly suggest an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://hearing-outlet.com/uploads/files/202109050611448843.pdf In PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/64106625706.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/furilegitupeposi.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/43186653913.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/28031346081.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/fubisuratonotubi.pdfIn PDF document text
    • http://forti.in/userfiles/file/8696073161.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72955420444.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/gemagosusese.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/waxadi.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/6059443618.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/93678545791.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/nirumenovalutef.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6145f40bd8cde.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/rurujuvebiwo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb2d864f8---54706330176.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/38447012048.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/92465779039.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/robakidatenufifugaxok.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/19610855866.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/jipezepubet.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/jagufapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=idle+forest+lumber+inc+mod+apkPDF 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_off0000b3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A8 11064 bytes
SHA-256: fafc9ee9738312b9f2abc2e47e86bf36b4cbd7bc30db9ccee0b807b9fcf66328
font_01_sfnt_off0000cd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD30 17204 bytes
SHA-256: 0651daa43f76a47bbf062827544131bf07e37e285b372a829e5e746d9f7cd7ea
font_02_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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