Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cc3c96ec5629f4…

MALICIOUS

PDF

68.7 KB Created: 2021-09-16 02:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d3489e62e44b76b9818ce0784f2290d8 SHA-1: 5600d468ad7df34ba33375e10eab31ae8704d733 SHA-256: 26cc3c96ec5629f4d03e7089ef8a40f28cc925e155865387c4f37612a8af0c5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=how+to+read+mms+on+android PDF link annotation
    • http://halanmilk.com/upload/files/68572039202.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/zulezufeveluvifiji.pdfIn PDF document text
    • https://led7.ru/file/kurorarofo.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/48587010634.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/bufizovifa.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/niterub.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/46929827292.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/bozisopigatomosuzed.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/50556782414.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614179fec0c45---32221664818.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210912065401.pdfIn PDF document text
    • https://pindimana.in/uploads/file/16998016648.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/jomanepijo.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/zodasilagojubuko.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/19066011581.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/bexedenevulodubujo.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/84737972830.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/6188411754.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7cc398c5---zobekomaxowibujagozax.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/21582344946.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/tibowafuzikusugolawa.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/zukiwipakokibulajebe.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_off0000b126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93D 10440 bytes
SHA-256: 064103d0624ee8a815f8b3eb77e4391ee9ad94055c4756f16faa49af4d3edafe
font_02_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 14496 bytes
SHA-256: a3dfc06959045eabd52cfaf6f4aded67ea96626f4b7367ba8d58086c6ee39538

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