Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a1e26072453215…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 16:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07666ad3080315534cdc0b089b7004d2 SHA-1: c3ee3bc8bfdf1b9c2203a9faebcbeecc1991911a SHA-256: f3a1e26072453215716166771ce17706ad48ba2889dbea6ce5ece85e0675f268
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests the document's primary purpose is to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and external links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=temperature+on+snapchat+android PDF link annotation
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83602579592.pdfIn PDF document text
    • http://benetalent.com/upload/files/tonujulaju.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/31056556430.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/towodu.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/duvevubu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bokekuniwumedixosu.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/dupawukevawamoge.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/jafufuw.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/15411462471.pdfIn PDF document text
    • http://tid.vn/upload/files/70729864330.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/51773658.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/55955953463.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/49080749703.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/13560440448.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/loxujawemefivoli.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/lomezututojuwujoja.pdfIn PDF document text
    • http://opersan.com/file/96660620677.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/zazalazutofaboz.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c0f337729---86997828697.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/95773494606.pdfIn PDF document text
    • http://saaretravel.ee/images/file/faxumalebujefamosorex.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/69211593002.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/gikosafedafumi.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_off0000b4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B9 10796 bytes
SHA-256: 8c0c9ac4d751c56f06552c4e707412536a62b6acafaa0eda289b391a27acfcdc
font_01_sfnt_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 15528 bytes
SHA-256: 313d4c851594b5b93fc4556cee0ebc5f7e0dd5289a3a6a34a295eb1f432e6f34

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