Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedf7eb18ce694ac…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 14:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 240a1a01aec27ab2aee0fed654769e4f SHA-1: ec83d4ea42cb6a969b52fe9ed1ac90c3f7be635f SHA-256: bedf7eb18ce694ac8423eb70265c2c1442e9243ee3ff90ce4c0f3ae846b791c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm pointing to numerous external URLs, many of which are on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://edouardweil.com/userfiles/file/86006003643.pdf In PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/zijipavir.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48fc71a39---93450259981.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/1106190822.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/29244945406.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908024725510131.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/pasubiginu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210904002544.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/sevusamisijovajuf.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/goforelo.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/34322229645.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/dumutefobajajineta.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/80237816895.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/26553243756.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/suwasupuzememutewageji.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/19425290991.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/41735760012.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e97801ef3a054d32d8dc047de694b280/somomerurekufetorafejabow.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/xujupodanonigevuz.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/68581613320.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/wozerero.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/13594903533.pdfIn PDF document text
    • http://innersolutions-uk.com/file/34943203103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=one+punch+man+mugen+apk+downloadPDF 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_off0000ca7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 17640 bytes
SHA-256: 4a29f14529cda805916dab65eb14354bef94aaf5d43795499741a99b1d40d635
font_01_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 10804 bytes
SHA-256: 13bb71da14f2566106ade656191342bea38731fdf8d55155bb3dc8cf9d73900b
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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