Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1f040630b6f80b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 15:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f232b487890b1057a1b6c5a07606244 SHA-1: 759ea66f9661e94308e6231a5b61061eb8c2b065 SHA-256: de1f040630b6f80b83daa0cbfa95ad5a0f7139c74154e415b932f6962051bf16
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, with a significant number identified as part of a link farm on disposable hosting. This suggests the PDF is likely a lure to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613630f32ed65---ziguwoveroxafulovolez.pdf In PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/15386318659.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/57534722879.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/tajelepefezobinumaxufunij.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/68823251338.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/83674323269.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/95142824396.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/sujobosuwomuj.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/keguriwila.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/73885101335.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/wafewuguxafop.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/89783775144.pdfIn PDF document text
    • http://freeorden.com/media/file/12087447640.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/moxijafufonenuzebafazi.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/forilamexepodumixofa.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/vixoritatezurigurorajimor.pdfIn PDF document text
    • https://digireg.com/upload/56840757850.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/95896479024.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/a62i2orqitsft93g625qute21a/2479801467.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/zojoraxemukox.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/migexizuwajudujiwovofu.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/nudosajotivazepe.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/9406841456.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/55025044944.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/wodidotafanopukumalugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+transfer+files+from+phone+to+sd+cardPDF 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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 10960 bytes
SHA-256: d478628a93bc9391b1316ce6bab00dcc82104d114496472433d5dd6b5aee708f
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 17780 bytes
SHA-256: 2f128d5b86e4b653e8c91b9b9d8b9f63e68ecd1da6173193a471e4369d2ad60c
font_02_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1