Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a94f7e8975956c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 14:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f5c4d0c96e9d983c815abdb483f2085d SHA-1: f2c0f8c96dc87a0d09d8016728a32b783ca912e3 SHA-256: 17a94f7e8975956c199ff814e755ed9f51bf6e4d43cf28c1131e7d2c6735364f
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a deliberate attempt to obscure the true destination. The presence of PDF-specific heuristics and the authoring application 'wkhtmltopdf' suggest it's a crafted PDF, likely exploiting PDF vulnerabilities or using embedded scripts to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://crysiq.ru/uplcv?utm_term=how+to+download+psp+emulator+games PDF link annotation
    • http://tetraeng.it/userfiles/files/55629776480.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/15248888876.pdfIn PDF document text
    • https://nistd.in/userfiles/file/2455173522.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/dewejijuxulotanogidalej.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/80397438688.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1c43dec6---noloresafaxuromuniwedi.pdfIn PDF document text
    • https://fptica.ru/images/file/matale.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/panekatokedagozujodu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/fodejinavijuwumufi.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/fejimuzo.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sotitatemoselugifaji.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/teduzavikexolemoz.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/88381381973.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/29406179878.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/pavisuwuwejiwotise.pdfIn PDF document text
    • http://pinxedien.net/upload/files/99143738424.pdfIn PDF document text
    • http://katachizu.com/img/news/files/pibofujumu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f703c0da9---3509158319.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/femowuzobinaxan.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/masinusejezoxawejojigulo.pdfIn PDF document text
    • https://grnca.org/img/files/files/meputenido.pdfIn PDF document text
    • 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_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 17544 bytes
SHA-256: 4cdcf72fe96a38915c78eeb13da04b572a0ee354b46e8432861c2c3663049439
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 10820 bytes
SHA-256: 875e96ebae81e989d1df1eb58119226f72070f200f8d89fe73ca296f1bd09766
font_02_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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