Malicious PDF — malware analysis report

Static analysis result for SHA-256 15264f46a1b5b04e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 21:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf4151aa1077e2132117229935389191 SHA-1: 6fe970b00e7688027f8e62704535eef063e43600 SHA-256: 15264f46a1b5b04e1cae7f2e7ccd2a5ff9a83d306a5b0c30f541863afdbbb311
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://gabinetortodontyczny.eu/userfiles/file/37045726468.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/903f8b1c5b2dbad5f0a7ad934596d1e5/zewezibatutofinimofadoxux.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/8303640292.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/76882814732.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ninawulesowena.pdfIn PDF document text
    • https://mihalex.by/files/files/katidemilinowalepu.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/janenujejozineg.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/65640596840.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/melirebipuvizaz.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109161054185317.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/wokaliwopotifigopiwamek.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/jupomif.pdfIn PDF document text
    • http://dialogueinpraxis.net/files/docs/30642567026.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/14573435179.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/puxipekamovefuwimopufi.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/lupurapapebetidese.pdfIn PDF document text
    • http://crm333.com/documentos/file/ropipadedezozar.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/71559553266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=george+stone+stick+control+pdfPDF 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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10764 bytes
SHA-256: dbce51091ebadc416028fe85c907f92557770727f93055e785c4863fe78a059e
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 18036 bytes
SHA-256: 4eb0f679bb4862a6a43140dbd53821a78f71d57bd1b3f5745d3cb124fd77b581

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