Malicious PDF — malware analysis report

Static analysis result for SHA-256 d589a189580c5b8e…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 03:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69797e8db84b417681d8fff29d4b3e6f SHA-1: ce06ab0953c4f7150eff8ae6e16b30bc8d84ce7a SHA-256: d589a189580c5b8e356d48e4d0bc933da06ee55865a5199f4a623aa141d7cf15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, and numerous external URIs were extracted, suggesting a phishing or scam attempt. No scripts were extracted from this sample, but the overall structure and URL distribution point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=chrome+clear+browsing+data+shortcut PDF link annotation
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613193fe8adb5---1790753648.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/73858051942.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/90095599554.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/mosiwagimejubatuxawezi.pdfIn PDF document text
    • http://splogservice.ru/content/files/78736033439.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219131212224871.pdfIn PDF document text
    • https://soechi.id/userfiles/file/66829463911.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/44393659326.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/43119960526.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/bogibivumox.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2747889c0219b5eafabe5dea9192cac0/bigomobeligem.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/46749936619.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/wosomexorewipepixalorin.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/49785962461.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/91824871030.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/96390439695.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/41181833212.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/vexanadubuwitivezejoxa.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/tikezigof.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/84461044296.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/3125191979.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/72920233731.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/seditajuxoruvulone.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/92457322343.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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 11176 bytes
SHA-256: 34d320419ccb37a913904b803c5fbfe3df5bc3c5623790b4bb9814ab1d6473ae
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 18616 bytes
SHA-256: a9c058e8adb056e3e6fd2fbbeb55653773831530e32a064b82e13db50b1b4586

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