Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee439ef4e3247e72…

MALICIOUS

PDF

67.8 KB Created: 2021-09-29 14:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08325f89e3ed6b41f36e2bba0bb81945 SHA-1: 2463f2f62e99ae43fbdb682bfd67ad5fc3441fd0 SHA-256: ee439ef4e3247e7276eaeccd6244bd51c2eee505741be998f3f4d0e13a8898a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs suggest a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tradingphrases.com/userfiles/files/gitepevofuzew.pdf
    • http://mu-rrrc.com/userfiles/file/satewisujukiveferexizepu.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-29/20210929075411759864.pdf
    • http://dinskayarealty.ru/media/file/xewig.pdf
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210929174322722931nrvpcg.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/16691611353.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e61dfb14997a0c99f9b860e6ea355ef/kexifinimapa.pdf
    • http://botosani.ro/img/uploads/file/86181170159.pdf
    • https://tdfstore.it/file/kaliwelinefabuf.pdf
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/11377944203.pdf
    • https://rentcar888.com/uploads/files/202109161008315877.pdf
    • https://fluffy-chins.com/images/file/votikalele.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/80144741635.pdf
    • http://quatanggiabao.com/images/uploads/files/kazukiroz.pdf
    • https://asiapharma.la/files/files/fajozonenivenavejatikunu.pdf
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/75263794100.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613292100bd93---karosezazon.pdf
    • http://hilimall.ae/uploads/files/lasuxi.pdf
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/73647174958.pdf
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/vemutavetalovim.pdf
    • https://avukatwebsitesi.trakyasoft.com/upload/files/84057281898.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=algebra+1+chapter+4+answer+key
    • 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_off0000ac2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2A 16792 bytes
font_01_sfnt_off0000c441.bin
023793d66e7cfc4335e0a88af3d3c4e565af43d22673996605ff14f60fbac343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC441 10984 bytes
font_02_sfnt_off0000ddb2.bin
9b36b5f90affe98b69919962c21a1f62c71600827d00db493a513e0eeb97838f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 14552 bytes

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