Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc11316316d498e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 16:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 991aff0673655028bb5f0ac7a77dff6d SHA-1: ee50e8d8f2b2dd12e45f44288103a80a55cf6dff SHA-256: ebc11316316d498ece79804694b3f7efb7dce02e4ebaf1bdcf0e74101ec8e040
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to unknown domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, flagged by heuristics, further supports malicious intent, likely to redirect users or execute further malicious actions. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.lsv-wittlage.de/ckfinder/userfiles/files/61989660592.pdf In PDF document text
    • http://seoulgreeter.com/userData/board/file/gelamefatetoso.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e701bec552---rexaxaba.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210915160732.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/69020576048.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/29964310875.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/nolesezidosodix.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109040503324039.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210924_221619.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/riwopo.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/jawomekopetid.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/41547479589.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/77252474072.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a6f47ba46c1c29e339cc53f023ed9b02/kodazubixasiwuwavop.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/71399217510.pdfIn PDF document text
    • http://tzsunup.com/upload/mudirixapixinumuvev.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/47244125844.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/wejawajefekekewezu.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/lozopem.pdfIn PDF document text
    • http://staropolski.net/Upload/file/fumafe.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26872620201.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/84292116901.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/fitubifatenakikamopagug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tank+stars+hacked+apkPDF 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_off0000b0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A0 10408 bytes
SHA-256: ae6765a2e859d9b94c07b1417a6ab945e586a662fd224508f486d12bc0d41299
font_01_sfnt_off0000c82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82C 15376 bytes
SHA-256: 345aef7bbeab948d73403b1c307146ceb399df87936918490e0ca6cb7d1eedba
font_02_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1