Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c08687f0cf1de94…

MALICIOUS

PDF

76.6 KB Created: 2021-10-07 14:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0e17190f7f23a8194f98bd7222782874 SHA-1: c33b6bbb5e2b002b0dad07b0f2eb81ae5d877c58 SHA-256: 2c08687f0cf1de94d5a053e6b0e7475da533e23e876cd1e26b97e5a16964f980
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URLs, many of which are associated with link farms and disposable hosting, suggesting a malicious intent to manipulate search engine rankings or distribute further malware. The ML classifier strongly indicated maliciousness, and the presence of embedded URIs further supports this assessment. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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://cructi.ru/uplcv?utm_term=creative+writing+examples+for+kids PDF link annotation
    • https://ksboutlet.com/file/files/92434219310.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/voxezizisexarelobenuwav.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/tamaf.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/1782363572.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/pevodekawarufixojali.pdfIn PDF document text
    • http://davcpundri.com/css/file/sozavemudepen.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/xakujasajusijavomof.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/70411542835.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/wuvazigivudixag.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/76784213664.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/kiginosemo.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/newowitufeve.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/73981170190.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210911084637.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/jufija.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/misiwiwofimugotiw.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/mepopiwavila.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9ac15a425a68454eb56314859aef0a7/99375546735.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/sutevabaku.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/10613607554.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/tedonus.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/11791132984.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/fabef.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_off0000c23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 11216 bytes
SHA-256: e7729a037a29ead4dd80d7612eba6f3625e544c74fdbd69ccf02b6ec2c7bd9bc
font_01_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 18040 bytes
SHA-256: c82ea69a233a9e15ebdac6b6ca8abde091c982bb2e91df9c827162871f5903af
font_02_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1