Malicious PDF — malware analysis report

Static analysis result for SHA-256 247ceefdeea805d1…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 17:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 814c2ab79dc416e46dad36b3d113bff1 SHA-1: cde1056e76ad396bb7fc14d816a021434af3db17 SHA-256: 247ceefdeea805d1cfb69491a094893044c49bdd0e2af824c0431952fcb9bd06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or SEO manipulation scheme. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.ecvbrass.ch/user/web/file/wewizovujukanus.pdf
    • http://xn--aknmedical-yub.com/uploads/file/12900199318.pdf
    • https://bongkartuantakur.com/contents/files/71125049704.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161498f2bd5b04---jugowunilirubojisabow.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/buvokibimura.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/99016593273.pdf
    • http://stavo-bazar.cz/userfiles/file/junerozerikemagoneku.pdf
    • http://rvhifi.cz/files/file/juvimoferamufe.pdf
    • https://on-call-anatomist.org/ckfinder/userfiles/files/libavavujati.pdf
    • https://zlataraburmevuckovic.com/files/kidogikixom.pdf
    • http://huijingweb.com/upload_fck/file/2021-9-15/20210915171813217308.pdf
    • https://kuni.ro/app/webroot/files/userfiles/files/31054951752.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130045b87b2a---43221925244.pdf
    • http://katour.ru/admin/ckfinder/userfiles/files/57443035743.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/zefarix.pdf
    • http://www.lbtfilm.com/uploads/files/fodosujolivir.pdf
    • http://xn--aknmedical-yub.com/uploads/file/jetumijipab.pdf
    • http://esistore.be/userfiles/file/6667567333.pdf
    • https://qpshouse.com/upload/image/file/jijozowonixesivujeje.pdf
    • http://ideatity.com/ckfinder/userfiles/files/wevatujalilizexunolux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+handwriting+app
    • 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_off0000aef2.bin
d57fed18e992aefb2537e1422a3bc6ca2854a6b9a97b1bc773ed4f7e954f682a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF2 10392 bytes
font_01_sfnt_off0000c638.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 16792 bytes
font_02_sfnt_off0000de4a.bin
18b8c409b4b9a6cf3eb1b7b780a5740c7deff2476ead8cea251d24c4566f33ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 15512 bytes

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