Malicious PDF — malware analysis report

Static analysis result for SHA-256 667cb98368e351f4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 09:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c404748b60002ba17baecbe855035da9 SHA-1: 6611f31265c3f68a69c69c44e98ca00acb0f2294 SHA-256: 667cb98368e351f41ba7ed0f205ca97aad68bcc79a676f01257d535a2542fc16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for malicious purposes, such as phishing or distributing further malware. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=loopsie+3d+photo+editor PDF link annotation
    • http://ingenermarket.ru/userfiles/86219842539.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/40722642695.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109052349017167.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/mebogelezipiwedovovi.pdfIn PDF document text
    • http://balatonfurediallatorvos.hu/userfiles/file/84191131593.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/sewatovopawo.pdfIn PDF document text
    • http://sieuthibds.net/images/files/40003520465.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/laleranapegebibizaruxep.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/39249277860.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/zijidilo.pdfIn PDF document text
    • http://cichanski.com/Upload/file/39849405996.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/92435773336.pdfIn PDF document text
    • https://dental-essence.com/admin/userfiles/file/naludugenumazurakizune.pdfIn PDF document text
    • http://geotersrl.it/file/58840725226.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/5448331151.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/wobabufebogisemejigi.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/lufesezesonimi.pdfIn PDF document text
    • http://askaudit.ru/price/66395860994.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/kexikulubupuwa.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vopewivojobilig.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3b228801149b27fb5a3b3964526d6fc3/segososopetepelapikufe.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/31678830475.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/rafozezuxupo.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_off0000b14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14D 10304 bytes
SHA-256: d1b99e43314875a3865e175dde1e2213579b10b22a6b282ecdf66f23e83bab8c
font_01_sfnt_off0000c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 16708 bytes
SHA-256: e2dc7ea9be191a0bae9f1a0c7d919d4adec864ede07e689f08572aace3b3a708

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