Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3913a1b6f11124…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 08:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cafcb7ffac0d57a2fd914b740323a8ca SHA-1: 64f37e6d00c1d250e4c583f1fbdfe40b492eb861 SHA-256: 4e3913a1b6f111248a75b8aa0ac757444922d17c96c8a7be459fb51260715bfd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious 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 https://irlanc.ru/uplcv?utm_term=install+mobdro+tv
    • https://kapefashion.com/files/files/tiguzapulasuminob.pdf
    • http://okcashbagusa.com/uploads/files/ronikivodexakuraxoboza.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/719827554.pdf
    • http://solarwindependence.com/ckfinder/userfiles/files/66155508887.pdf
    • http://budgettranslation.hu/sites/default/files/file/75912521284.pdf
    • https://stalbeckers.nl/userfiles/image/file/35238457962.pdf
    • http://www.dkmodels.net/ckfinder/userfiles/files/sudupajumigonav.pdf
    • https://horacebatten.com/ckfinder/userfiles/files/3457144748.pdf
    • https://weborder.cloud/userfiles/file///nevomusex.pdf
    • http://fabtur.ru/upload/files/gigoniwuruwawuze.pdf
    • http://bibliotekaludwin.pl/img/upload/files/netajarigolefijuwimumage.pdf
    • https://ikima.fr/uploads/file/kozupipolekupefiba.pdf
    • https://szallas-karpatalja.hu/upload/dimeterorutabufukis.pdf
    • http://shijijiaming.net/filespath/files/20210917005518.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1f2e862ad4dab7a8b89be03013f3fa2/xasutesusufeluwujazoru.pdf
    • http://ngor2-3.com/file_media/file_image/file/negewekemapotezus.pdf
    • http://hueide.com/upload/files/digizasowosoj.pdf
    • http://greensquares.in/userfiles/file///rezavedafobapime.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/ketafivugulekamafu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7e11cc89---97208459762.pdf
    • http://www.cenlafilm.com/siteuploads/editorimg/file/jixegaxibatexigit.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wepelujata.pdf
    • https://ncsccalgary.com/userfiles/files/dofetilamemivupox.pdf
    • http://bienbao.net/uploads/files/fibuwonodiriwuduwupa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b35f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB35F 16792 bytes
font_01_sfnt_off0000cb76.bin
d5c0d55bb8a50aff0555000f6630954d32710e11aa25db2279fb7925b8640e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 10344 bytes
font_02_sfnt_off0000e2c7.bin
069dc4203aaba856eb687d129798d9aa03197bd0d49f286f4a858570ac020939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 15608 bytes

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