Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eea507ffe164982…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 18:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87c84fb07c03831dc5f2dc628d15925d SHA-1: 82d68f5e106eb40cd68332a5bf31138b532cd690 SHA-256: 8eea507ffe1649820e81436e21b7230655a252b012c138d593b04a9a33409568
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social engineering lure to prompt the user to install a browser extension or update, a common method for credential theft or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://cbestdesign.com/ckfinder/images_store/files/45383796743.pdf
    • http://myxroad.net/upload/userfiles/file///97755957050.pdf
    • https://zagorjeadventureteam.hr/files/27374376659.pdf
    • https://ph2020.org/FCKeditor/file/gezijonogugoxujixol.pdf
    • http://carrasvilla.es/uploads/files/xofirarular.pdf
    • http://consorzio-csa.it/userfiles/files/34161496017.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614073581cb7c---19403668113.pdf
    • http://studiobaldizzone.com/userfiles/files/71141001983.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613a771a49e63---38974214410.pdf
    • http://prestopc.it/upload/file/jokegog.pdf
    • https://pushtypathshala.com/demo/aims/files/images/files/57094868644.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/90558590564.pdf
    • http://hitecds.com/userfiles/file/mikedinaxej.pdf
    • http://asr-net.ru/uploads/files/nidazexu.pdf
    • https://moyaexpresss.com/ckfinder/userfiles/files/11902981830.pdf
    • http://pension-erlkoenig.de/img/editor/file/depomexunovowoku.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/japuwovolosilidaweguje.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906145330641752.pdf
    • http://unite-chem.cn/upload/files/zabetifumorapemijix.pdf
    • http://www.peretprod.ro/content-images/file/siloredaluwod.pdf
    • http://raczpalinka.hu/userfiles/file/6082024018.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+edit+a+webpage+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cb.bin
610ced9d77336526566bd0b87461570dc948aba480a4511c77722b7828af5f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 19676 bytes
font_01_sfnt_off00010bef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 16792 bytes
font_02_sfnt_off00012406.bin
322d527f348818abb9dce556ceeaa8e278cf8cf5ac2078ac10af9cf1131f5bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 10568 bytes

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