Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64f246b7ca346da…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 06:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b36edd88029c28c10c8c1106847fe78f SHA-1: f8c53f63c4f8e26ee05495762e47e3706b518ef6 SHA-256: c64f246b7ca346dafa960d6817517290d1ad382d37c8deb8a4d31f6fe1778a8d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection and a high ML score. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using numerous disposable domains for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=x+rays+frequency+range PDF link annotation
    • http://garage-ys.info/js/upload/files/mozarutaw.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/wawojajimejud.pdfIn PDF document text
    • https://geloracinta.com/contents/files/24639637004.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/vawerifelu.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/tolukeru.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/31658898934.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/88308379514.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/kideriki.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/3423079048.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/sifenepujuw.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/50824019606.pdfIn PDF document text
    • http://kdekdyjak.cz/data/josufurufel.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/49936220781.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/23970361173.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/nepujukuragotetolebukomu.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/semikopujadosizubo.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/pawusifaxukukexisufapabed.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451e5c19f81---nalijojikomipexunopuwife.pdfIn PDF document text
    • http://gnox.vn/upload/files/76829276257.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/74430350087.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f579875dfd---67731182295.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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 16348 bytes
SHA-256: f78b6baa95fa74f2e54585a04f80b831d22271de9907e79d5536b2bbf3f38c25
font_02_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 10524 bytes
SHA-256: 8bf2acc1dc69a0e2877101e01a1877fd264b44339bc012e24f129478595a1103

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