Malicious PDF — malware analysis report

Static analysis result for SHA-256 5461e5c4ec236e68…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 13:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1a3499cf1c9aa427dcfa6940a32a5a9 SHA-1: e1b46e87c64aeca90c067188bf23e5ee3894335a SHA-256: 5461e5c4ec236e689c38789a4fdc965681ec3d3361b28c2e1ac8b0c435946ab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable or low-reputation domains. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware delivery.

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 https://chcial.ru/uplcv?utm_term=chrome+dark+mode+in+windows+10 PDF link annotation
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/23387986912.pdfIn PDF document text
    • http://bubb.cn/up_file/file/fotovavexowixededafoj.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/venuxowadupevaridevajadog.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/segarozujivosubi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcbdee8a0f---31418647819.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/gebuwove.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/walolexisefo.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lufodolezepewelupek.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/31007027716.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/13880104141.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/nizejolubuguf.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kujopadalepoziwipikisila.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/16839893918.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/fibeke.pdfIn PDF document text
    • http://guitarenko.fr/img/files/xumuzavuda.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/zobazubi.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/23272053701.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/sirogigefemuvuf.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/2887295155.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/46688774486.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/50782650776.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/1565791800.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_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 17752 bytes
SHA-256: d5628fdf1d6e47f85bcb258d447012788dd2323b5900b0e8d12611fabedc2785
font_02_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 10752 bytes
SHA-256: 940fe20b60d259bec3c67937f4765839ed39b05196a3999f345cf3ccb4ad72c0

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