Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a4c39f61ea17a7…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 17:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3c7d2075cca236458a2f5389cc115dc SHA-1: 93228b2dd707978e7cc9e50d68bba15b8ada3c4d SHA-256: c8a4c39f61ea17a7cc78cf3f47c085b6e3f959a6552a580823df5da19f8f03f7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including one that appears to be a download link for an application. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=instagram+pro+apk+latest+version
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/63786874061.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9a234105---69854704458.pdf
    • https://artasedanasingaraja.com/uploadfck/file/82533385514.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/g3dco727n8bplv1bvkm5rgtgu5/74072636270.pdf
    • https://toocapen.com/files/36429354339.pdf
    • http://kirakuramenandsushi.com/uploads/files/vivuniw.pdf
    • http://elateridae.com/images/FCKeditor/file/55872502159.pdf
    • http://studiolauramoschini.it/userfiles/files/84466153237.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/56286350649.pdf
    • https://jjpremiers.com/files/94817860110.pdf
    • http://boekenwinkelindex.nl/images/uploads/xemozobowabajirusa.pdf
    • http://poetische-malerei.de/web/editor/files/bamuriki.pdf
    • https://denizlihorozu.com/resimler/files/21977142568.pdf
    • https://uleshuzatabc.hu/files/file/49765736566.pdf
    • http://marymo.ru/uploads/files/dalugemup.pdf
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/jejuzeriro.pdf
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/53256011714.pdf
    • http://matras-devison.ru/upload/file/zuwawe.pdf
    • http://sinproval.it/userfiles/files/ludokuxijezijibubajefi.pdf
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/97320844592.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/vavubizefafenapukokomarok.pdf
    • https://altstudio.be/app/webroot/uploads/file/jejuwadopu.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/seruzomirekuv.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16216064226.pdf
    • http://geoscan.it/userfiles/files/jajuvugun.pdf
    • 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_off0000ed8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16792 bytes
font_01_sfnt_off0001059e.bin
ffa2096bdc926fc7636a99ecdcb625fbdf6a6b5247004582eef479643b74ad06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 18884 bytes
font_02_sfnt_off000136c6.bin
7821416d8f278f1edf2dc8b586e22fe4e7d479974057884128c9383af20eca5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136C6 10704 bytes

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