Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75f867dd065ef5f…

MALICIOUS

PDF

71.9 KB Created: 2021-10-03 13:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4f095e39651dea057a659e8e2715d71 SHA-1: 14b15f0f7044ec70c72e410b4609b2763d71fea3 SHA-256: c75f867dd065ef5f3b6ba34712f9b2d701785f5c0a9c11bf0fec19610601c523
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://medvor.ru/uplcv?utm_term=reading+a+sectional+chart PDF link annotation
    • http://studiozammuner.eu/userfiles/files/7669181169.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/85433588339.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/49885462198.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c31134e1---64609142347.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tixavanujabipapinu.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/lukapomujawibepoput.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/86730344406.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210919233008.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210906032322.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/63980370696.pdfIn PDF document text
    • https://adikkedua.com/contents/files/fevomemiferogiboz.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/gudevuganep.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/letuxasalofazo.pdfIn PDF document text
    • http://logicamail.it/draft/media/69805825476.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/fufudubevolusupamip.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/lujebidakijuvuvibum.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/46356394686.pdfIn PDF document text
    • http://fnathservices.com/upload/file/fixuteve.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/30128027646.pdfIn PDF document text
    • https://orangerun.re/photo/files/sejowibuwatopa.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/54830848922.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9feadd302---narejezudise.pdfIn PDF document text
    • http://masonhn.com/d/files/wilipijofanuganodad.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/95141273624.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/57680511046.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/67245648110.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/balutabezofuwamumimusisoj.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_off0000b629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB629 10696 bytes
SHA-256: 4cde3ed52248e05785ae52b7e59d9df1148cfae9160e47362bb3d6787f0b5145
font_01_sfnt_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 16900 bytes
SHA-256: 0bba1c2568ada9849e58579a1b184fa624b276ad4189e09df399f91813d78a0a
font_02_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1