Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d8f8b914f12d88…

MALICIOUS

PDF

80.3 KB Created: 2021-10-12 20:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5db6404db5d7c54eaf0b54038f1c519f SHA-1: e7d76c91714ddab0d44fceb0a457f94b67359954 SHA-256: d5d8f8b914f12d888256eef877522fd3e06b4e02710f936cc01de1490ee7a191
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of malicious intent, as does the ML classifier and ClamAV detection. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristics strongly suggest a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://putzlappenborner.at/editor_up/52645157070.pdf In PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/xaterejo.pdfIn PDF document text
    • https://ijpdua.com/contents/files/jozezulizufedofisisoz.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/zugidov.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/12781131128.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/fanidaxazopi.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rebowovugapapo.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/23649078910.pdfIn PDF document text
    • https://mkart.it/uploads/file/79654061245.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/24076339829.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/ketugatiledimixozelowu.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/81544358255.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dcf34a9bc---29490190153.pdfIn PDF document text
    • http://grimastone.ru/files/55489725895.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/vapomadabuterona.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1633629149381002369.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/44902861897.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/vawikosizev.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/pawudulujodegisu.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/2240562156.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16131503110f50---vonisemafagibir.pdfIn PDF document text
    • http://health-bridge.in/upload/file/18230041054.pdfIn PDF document text
    • http://talesma.com/E/file/gadokutib.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/faronizekiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HKUGBsJGI0E/uplcv?utm_term=multiplication+tables+from+1+to+25+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_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 11320 bytes
SHA-256: 3c5aefc487b92e78a8a05033ae3228b861524ad1aba37b901c52887b35a31d3f
font_01_sfnt_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 17496 bytes
SHA-256: 386e7ecf4f219f6f20496be69305703cc6353133fb82ad6e18fe10b73c971647
font_02_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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