Malicious PDF — malware analysis report

Static analysis result for SHA-256 682e3253608bcc41…

MALICIOUS

PDF

89.2 KB Created: 2021-09-11 07:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29c8a880bb2023199c26d6adedb82769 SHA-1: 05d4d1da5417e93ac55914f613e68c99a8a15f96 SHA-256: 682e3253608bcc41ff5614499fc3ed29e0c599005a457a3172c08a69d594f5cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://ketchas.ru/uplcv?utm_term=tetris+extension+unblocked PDF link annotation
    • http://mastervin.ru/files/file/jetidikibi.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/44149018954.pdfIn PDF document text
    • https://datenglagi.com/contents/files/18112858987.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/budupoduwogoseni.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/12097080066.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/lotinuxexefuduzeno.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/68052462240.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/91244443076.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/12061848246.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/41946738405.pdfIn PDF document text
    • https://kaisar168.com/contents/files/lovefinegabatinojera.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210902033758_997295.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/68075814200.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/94534721406.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/b757ef.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/mofiniled.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/73281324245.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/tokoxapadawedumevazejuz.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5f32c4a4f4f36161e5a0b8ce7c8ee93a/4215533883.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/47812952290.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/63814103299.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/90044571233.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613958a0ed3ce---tuwowanemipojobik.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/baxinikilezapofezomolep.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fesonolurapokupe.pdfIn PDF document text
    • http://metall-press.ru/files/8425704875.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_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 18412 bytes
SHA-256: a39c8fc31cdef6ca1ff63a832e2e050aff34665aa07e1f57b47fe3cd1e24577c
font_02_sfnt_off00013eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB4 10596 bytes
SHA-256: 8c9ef17d5c959ded13df1a8cb473b6dfed87f957ac7d037be992780462e165ac