Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3e8b4a4c112322…

MALICIOUS

PDF

69.4 KB Created: 2021-09-20 01:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fae9254ddc3294ac27e1168b25e11fd5 SHA-1: c265713738ad103cf665847ed0c12eac5c281b64 SHA-256: ce3e8b4a4c112322f81588e386a4675d2f1b2eac6bd508baabb4fce0a1285185
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier strongly indicated maliciousness, and numerous external URLs were found, suggesting a redirection or download mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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.bevillelecomte.com/ckfinder/userfiles/files/xufiwosexokodefu.pdf
    • https://justforjetscatering.com/userfiles/image/files/letutozesipo.pdf
    • http://jsjxh.org/filespath/files/20210907102757.pdf
    • http://ingfrimale.com/userfiles/files/vafowi.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53776838388.pdf
    • http://sptcrane.cn/d/files/wuzid.pdf
    • https://enilubricant.hoakhanh.vn/uploads/image/files/46460592729.pdf
    • http://auxerretv.com/content/public/file/30018082764.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/13670178894.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/86018245401.pdf
    • https://inmaabiladi.com/userfiles/files/doxub.pdf
    • https://turasmobilya.com/img/editor/image/file/xomudulojuridarufakajip.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613838c8efe61---kugavopojidabovolabeneliw.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/nexinowuzedufuloxejez.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff12a96f9b---mivozawuxewet.pdf
    • http://chuabenhxuongkhop24h.com/images/files/35347310169.pdf
    • https://clap-bas.com/userfiles/file/59229499809.pdf
    • https://chatsystem.site/js/ckfinder/userfiles/files/69166332191.pdf
    • http://itaxabc.com/userfiles/file/20210914040931_1415569248.pdf
    • http://tatnhapkhau.com/ckfinder/userfiles/files/dowow.pdf
    • https://sinarlangit1.com/contents/files/zajoxuwetepud.pdf
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/xudotiwewa.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/42313081712.pdf
    • https://medgal.pl/admin/ckfinder/userfiles/files/29424608180.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/82135783812.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/54854123507.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kairali+news+live+today+malayalam
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b191.bin
c5a2fc9bc01d3290a767760d8aa2d5eb6daafe7e88fcdec69c16a144e5cf6f09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB191 10664 bytes
font_01_sfnt_off0000ca0e.bin
f997a6765a97dd72cd3a1537242e9dd059836f2bab80cb5f6d1e2d82e881b8c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0E 14448 bytes
font_02_sfnt_off0000ee6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 16792 bytes

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