Malicious PDF — malware analysis report

Static analysis result for SHA-256 be899f51992062c1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 11:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1844016de100a2e84fff4d966e10ba7 SHA-1: c5e0286330963acb0d4ebf1bdebc4dc7f83a01aa SHA-256: be899f51992062c1db0096b2452ddae3d30dddea66c89535040789afafa25077
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it is part of a link farm, and numerous unknown URLs were extracted, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ruedi-leuthold.com/userfiles/files/79580492119.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/96315280091.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210914_05C3A6A25718F63A.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/zebepa.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/36734815208.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/xifetiza.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2271cc88f775f7ed4fde35e594d5679b/sutelumifada.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/aa5bd09435fc8bee0e2b1ef99d64f8ce/17224531136.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/kefudogigexopepijoxomanut.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/83409211788.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/dolujakatatamelosal.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/rotesidijozuvup.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/nigedodak.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/mesudolefonetivuk.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/nevonomivapufuniwemajo.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/75869369148.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/79539677935.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jizijojumofogixa.pdfIn PDF document text
    • https://superpart.com/files/tirinusesupopipa.pdfIn PDF document text
    • http://djpress.pl/Image/files/60135423408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+mobile+tamil+meaningPDF 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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 19528 bytes
SHA-256: 71fb0f8a1728c506f35fba769bc7989285fd372f711df932ab55b56ae07e1eac
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 10544 bytes
SHA-256: af5e0cf96e447338ac6d9eef9d4fca7c8ee350fc4a8fcbeffed39c3d4683390c
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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