Malicious PDF — malware analysis report

Static analysis result for SHA-256 82892038442163ce…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 05:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc0270e2a647f575f40ed44c0fb546ce SHA-1: fa9c6fd56d2e9f3df7eadabd45d169cd6c55c409 SHA-256: 82892038442163ced317c5d941264886cf778dd6dadae97ed688f8303a5d7dad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The embedded JavaScript and numerous links suggest an attempt to redirect the user to malicious sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=yosemite+gta+5 PDF link annotation
    • http://southerncross-ex.com/images/blog/file/91850098471.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/zasurivokofufe.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/3315295413.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/bojidejuguwotenudizudukow.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/gebotabubinitonexovut.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613577e72ae84---butuzedalaragon.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/60041231911.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/sajazawurip.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/73987524809.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/79891228190.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/73867837031.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614167cee5813---zafetaruvafad.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/siwomenofi.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/18331449353.pdfIn PDF document text
    • http://daiichitelecom.com/uploads/news_file/97111235098.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/pisajupuvoditixudiwobupu.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210929103036.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/rukosufadetulizixij.pdfIn PDF document text
    • http://soc-in.com/data/media/files/daxexut.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/8051979342.pdfIn PDF document text
    • https://onecre.com/images/content/files/96406985088.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/gudimizudefemofos.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/68748032082.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///boxamakofugoxoninu.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/rebowewenosometixalinila.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_off0000b471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB471 10320 bytes
SHA-256: 0d4cdc8388c8a6ae1ba844c3360feef3747d34acec2f326d21d04bba32c620bc
font_01_sfnt_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 16744 bytes
SHA-256: 37417d652772da2af6dccace57b6759ae117354319ef6194bdd922f4cee356ee
font_02_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1