Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6de42d224aeeea…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 16:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9881572e0ab794acaaeefb0ee30fdf2 SHA-1: 5a2ce0f74d8c5d72238217a01c94e494a8cb08c7 SHA-256: 4b6de42d224aeeea233e4b656ed1b0fa8b004f6104ec2c86af10c368b25d3b8f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs pointing to disposable domains suggest a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of further malicious code or redirection to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://allytemp.ru/uplcv?utm_term=free+pdf+to+excel+converter+software+download PDF link annotation
    • http://zoldjogsi.hu/uploads/files/34038102507.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109162100059958.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/zekigobiragazovamaluw.pdfIn PDF document text
    • http://www.toptehnik.si/images/14287847895.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/fodubemuvuza.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/32316042118.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/pedijiwitonoliwi.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/cce2db5484ae7455ff60d1c8e71aeb9e/todizetudimaxofibijew.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/lalujuzudedesu.pdfIn PDF document text
    • http://watch62.ru/files/files/41011492946.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/busirotagamewula.pdfIn PDF document text
    • https://renault-service.com/userfiles/52738750923.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/kodogowibisizonozofijulub.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/tumodolivugefuwone.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/rewakexufozuruwox.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/netut.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/s0apohmfm2avo0r81qfl1ndnjq/7478622526.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/9868014914.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/13574769219.pdfIn PDF document text
    • http://apart1day.ru/file/dujegufawifokavotiteb.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_off0000d1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 16468 bytes
SHA-256: 0295192ab49d7db3dda98989c6c6c206de089a40c07a13a8df053ebede8564c8
font_02_sfnt_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 10752 bytes
SHA-256: ef8d1eaa77b037fcd11d15c144f7c5f5f22c6dc9faa822f86804a63cc5e24901

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