Malicious PDF — malware analysis report

Static analysis result for SHA-256 223a7b9a3f17cc11…

MALICIOUS

PDF

91.7 KB Created: 2021-09-10 05:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 384fccb38f14388e7ede078b57b2f84f SHA-1: efa5f05a254a0cc5f254ef722814a2c043a702aa SHA-256: 223a7b9a3f17cc111f64d7091acc2c30c57a169574fd82860bea7b12742bdc50
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many of which point to unknown domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/19192095215.pdf In PDF document text
    • http://houselandia.ru/files/73023724932.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/68909830135.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/73620238375.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/xomepef.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zebukibelakazemujapojo.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/24526070733.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/gusitetisepi.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/94100207673.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/69821931235.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/betuwu.pdfIn PDF document text
    • http://cabini.it/userfiles/files/6180453578.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/87345199478.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/bawixamud.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/benemomufekoxovizelimum.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/latodojutakuxexebunuri.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/82164632368.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/vizopopizegodizuxakijija.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/rejotun.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/50145964501.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/62156137855.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/60961604532.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/17551072713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=samsung+galaxy+s6+edge+romPDF 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_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 10960 bytes
SHA-256: 6efe022f7d24de104c2abc48e30efdc2620be3001127e25e8e78c11443e5f648
font_01_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 18092 bytes
SHA-256: 031cc3001bef2745a708346bf2612649942eb5fefc73a7b039cba154046656a7
font_02_sfnt_off000148b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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