Malicious PDF — malware analysis report

Static analysis result for SHA-256 7defac186d20b540…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 08:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b207730a7cba7c731e5cac8c5d5e444 SHA-1: e1d91dcf5880d927027ad8a3ce7ef66818818ce6 SHA-256: 7defac186d20b54075a5d98d9bde0d8ec68847bd893fd18c5680fca33d1e1036
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this purpose. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF format itself can facilitate malicious actions, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://hbfilm.ca/resimler/files/882956191.pdf In PDF document text
    • https://jkmart.net/FCKFiles/File/11181510552.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/sikabuzufotomobekawazizo.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210908105809.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/tosisafoxodalagamajudiwe.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/wubuvamoxepomavi.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/jevidefinarovi.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/jujiguvimizijojudawu.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/bizoguwexa.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/20796466332.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/1890848822.pdfIn PDF document text
    • http://asustainable.com/global/file/xanebiwina.pdfIn PDF document text
    • http://dsagco.com/Upload/file/92865711517.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/boxerotofetoguvirovenet.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/97696220000.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/toralobisatisadeko.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/wadiwidesi.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109021309435313.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/10893337223.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/nitufefo.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/39129942909.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/wapizavoduwuxalejitesujod.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/53335425916.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/5849231856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=36+sites+to+watch+free+movies+onlinePDF 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_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 16732 bytes
SHA-256: 1ca2805b5786af2045320d5b9e9c80113debf52385ed53de84eddae527a58683
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 10996 bytes
SHA-256: 3fb705c5421f16749dd063def4e289a2740ad6075a5ed1127bbd965c57ccf0b4
font_02_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.