Malicious PDF — malware analysis report

Static analysis result for SHA-256 2929c5f9a747ac6f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 22:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 271433dfb7019dd25683c875af17fef1 SHA-1: d52eca8b39389a7adfef017966a69a43d51f40bf SHA-256: 2929c5f9a747ac6ff3a6126758fa72fd32bebf973e407180db3b6fbfc9bd964e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic analysis identified it as a link farm with numerous embedded URLs pointing to other PDF files, likely serving as a lure to download potentially malicious content. While no scripts were directly extracted, the nature of the embedded URLs and the detection suggests an attempt to redirect users to malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rungruangsteel.com/public/upload/userfiles/files/12162975063.pdf In PDF document text
    • http://pekingtogo.com/uploads/files/bawap.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/39640373340.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/40087830310.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca80f3eb0---96338405351.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/36730285456.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-15/20210915190824310319.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/68007693514.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/zazabo.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/79561833461.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/9213959612.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/2306475923.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/53671734454.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/31753306352.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/24237869166.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/5638394408.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/vugugudaxilas.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/beturuviri.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/xilekedopofazegada.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/36247042629.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/wekuroruvena.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/gewes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+game+devil+may+cry+4+androidPDF 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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 10792 bytes
SHA-256: 351b724d2c9f27247fdcd60dcf53ce5aaa3915455ee4c224a7c788960130deca
font_01_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 18968 bytes
SHA-256: 23c50980b1a94dc584212c977cca6ce468bb3e851d9ff66cfc3c6865700260e3
font_02_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1