Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db0989510d0e7a1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 11:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc9e31b89a86488d4003076ce7acc862 SHA-1: fff68db39c3e2f64cbe7c9cc647cc63f11fb381a SHA-256: 5db0989510d0e7a1648ec1cf0858d94d7200c99b3846b17ed68fba8dfe654481
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests the document is attempting to execute code to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://cu-mbc.com/ckfinder/userfiles/files/26692729747.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totipudibafawivekifoled.pdf
    • https://tiklatakip.com/calisma2/files/uploads/27336176138.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/6301198940.pdf
    • https://franchisefarm.franchiseharbor.com/files/files/69989206167.pdf
    • http://koreabulk.net/userData/board/file/waxebatekijezuzifewivige.pdf
    • https://sonntag-immobilien.lu/userfiles/files/nibusexomiguwin.pdf
    • http://longbienco.com/js/ckfinder/userfiles/files/dagogaxizun.pdf
    • http://esoftland.com/userfiles/file/badegukogapusosijageda.pdf
    • http://yaqeen-eg.com/userfiles/file/wajuvezudat.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389ca650bfc---10621746481.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/levigate.pdf
    • http://nissanotogovap.vn/uploads/images/files/tapipofajopimomer.pdf
    • http://fra2ange.it/userfiles/files/rakiponosobisozor.pdf
    • http://yuemeism.com/uploadfiles/files/6419950226.pdf
    • http://sbcnepal.com/images/file/wilexaponowisiginolotoj.pdf
    • http://jafra-com.at/userfiles/file/xifurunavabigobepuxopo.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/99422173545.pdf
    • http://gemcom.org/userfiles/file/7564618605.pdf
    • http://progettocecinacuore.it/writable/public/userfiles/file/lotoxowazojisabafotigija.pdf
    • http://mmckno2010.zkosuchdol.info/files/72482455712.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/denajago.pdf
    • https://zemiigori.com/uploads/file/3491789965.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=airdroid+win+10
    • 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_off0000dd10.bin
140849e7986a6a8ff164cd7540f84d8de263a15705b4634f1ebc629ecde61857		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD10 17224 bytes
font_01_sfnt_off000109d5.bin
8c2a32cdb1ca18dc6a6f7592d503054c5555a4bea83bb3dfaa9a161afa9bd4e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 9876 bytes
font_02_sfnt_off00011fad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 16792 bytes

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