Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaec4c85a3f1fac…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 09:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89224fb024e46509b4d4732b485b2a8f SHA-1: f17c4872e3e95d350ac34217aeab5781a4379abd SHA-256: ecaec4c85a3f1facdeeda8ccd14c122f959d5d9bfea0b4a2b40601b0d1073d2e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://beerskiboot.com/img/upload/file/mogojipagulerum.pdf In PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/jevexufupibazidegutexolab.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/vajokoxixijanize.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/69303708540.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbec54653---wijizusozupewuvorawagug.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/37806658496.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/49361986343.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/pupumogamugabebosifij.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/02bc8082c59277f8be4830b0730f4351/50097707738.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58399529110.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/8267401946.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/biwesojodarowopanamanaxor.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/koredexemepopuwat.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/62581813385.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/61551174980.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/lasavejulusifoketuxu.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/junutifegiweje.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/40293622764.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/28193106556.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/14296046858.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/40389429970.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/79720732319.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/bosularaselodabux.pdfIn PDF document text
    • http://hbaoge.com/upload/files/kutixufomulakajem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=indigenous+spirituality+symbolsPDF link annotation
    • 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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 11040 bytes
SHA-256: 46fec4d734fa1664b37b78d552507bfe46679ef77c1e9a6d7bf65988bc0a3d1a
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 17092 bytes
SHA-256: 41836e770c1046abec07831c8c657fdc29469ed34b12b8a3ada2cafb0f125aed