Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d517796ea06c4f4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 14:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 293f748072b6c8c001e70a8dea3dd22c SHA-1: 27cfd4c34f48b8daed2318281ccafcc7f30c51e8 SHA-256: 4d517796ea06c4f46ab0e2d5757d773e4b5c42f8311697e7d554babb5a04a7a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=infinity+train+demon+slayer+watch PDF link annotation
    • http://fishingas.com/userfiles/file/suzuluwasiloser.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/maxejilasowowo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136acf6597b1---61139930539.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/64390478707.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/mojoluji.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/57039495327.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/96906389513.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/mudiniv.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/60463805319.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/nezuvekosesit.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/xubawiborufa.pdfIn PDF document text
    • http://btfa.tw/upload/files/xipixo.pdfIn PDF document text
    • http://capital96.com/userfiles/file/dosobinuko.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/muwelagaxuxi.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_32CFA01D9EA765D8.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/79390000365.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/27963468321.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/40961752316.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/7575497324.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210908055417.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eaa156afc---67554625693.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/gusanemupis.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tefosejusoxitifemu.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_off0000ce5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 10892 bytes
SHA-256: 201d90c294ba93df360c0310919522f6fee0a6fb8dad7d5dd9610b8a28c6c10f
font_02_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 19344 bytes
SHA-256: cf7d6f71d83a181254e209e38da2fac9e01d73d157b83218e44c4f01c648f750

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