Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae4f7c334c4826e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 03:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 215a87711e53b2b36454e4630d1f0f0a SHA-1: e28232f51678f2f80fe3fb36844823001c041bfd SHA-256: cae4f7c334c4826ed413ddb415e2789a0ad01348503b5abad5244210978e1c6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating it is a phishing or trojan PDF. The PDF contains numerous links, many pointing to unknown domains, and is flagged as a link farm. This suggests the primary purpose is to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://mfdesign.hu/files/file/77071210980.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/50a4ef848b86b6027f810afc29bfd612/selilijifiwitajulolem.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/tanelavojolawewezagaj.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/31633050123.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/fizeduzo.pdfIn PDF document text
    • http://trubaopt.ru/content/file/ziganalol.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/nikita.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/zotovumejenifuzixiripos.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/ratazazukovaded.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/30338118387.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/lesopejalivarel.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/71422800417.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/voniremuwu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345dcc113db---28161486542.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/75431247654.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/wesorirasetezofe.pdfIn PDF document text
    • https://tessuno.com/upload/files/61457830c6ff2.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/923502986.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/69384806492.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/13054378024.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/18098056429.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/kanefexerunujew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=generate+pdf+in+java+without+itextPDF 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_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 17052 bytes
SHA-256: d8c6642cc37c57188e2818459a22ae57b681e9aca7a2189eacbd9f47e3396afa
font_01_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 10904 bytes
SHA-256: 601bc10e3542e900363c4823688bbe20c51cf47dd242a5a9f5c3a8a5a90f9108

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