Malicious PDF — malware analysis report

Static analysis result for SHA-256 4030e63287e9e8c5…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 02:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cfab293c153990a3fa916b437109b34 SHA-1: 891c82549dbdaf72476d3a8dc197376b1ecf835a SHA-256: 4030e63287e9e8c5086934695e23d772eac356c0dad1d3484a808275a4b8a0af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as a phishing lure or for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=pokemon+games+for+android
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/14025529112.pdf
    • http://secretinvitation.net/images/files/jotekineterabapipaj.pdf
    • https://astoraccessories.com/uploads/ckfinder/files/17441944698.pdf
    • http://homeshopeez.com/uploaded_files/userfiles/files/14030805729.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/lujoputarifisevutozas.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/wezafilegesidugogebinezu.pdf
    • http://dianacb.cz/userfiles/file/27623761649.pdf
    • http://sahcarpets.com/userfiles/file/25187737058.pdf
    • http://partiaweb.ir/upload/files/gibazosotapewizov.pdf
    • https://worldmedglobal.com/userfiles/files/86403306075.pdf
    • https://shatalarab-llc.net/userfiles/files/16035838765.pdf
    • http://keifo.ru/ckfinder/userfiles/files/61172733486.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/58131790288.pdf
    • http://studiophotosfashion.it/userfiles/files/81130136371.pdf
    • http://stellarp.com/userfiles/files/tiserosipu.pdf
    • http://recrute.fr/files/files/daxuzarizira.pdf
    • http://hwayinn.com/image/files/20210916_105834.pdf
    • http://www.guus.edu.mn/ckfinder/userfiles/files/jizireluj.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/47533469689.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/23030026275.pdf
    • http://sziazsauto.com/uploads/files/futedazuvutakim.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i0ssb3vsju94sp831qu7c7qfpi/65064239618.pdf
    • http://nanoservice.sk/upload/file/1405391324.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_off0000af39.bin
0bf6ef1c05d6e6ba650d3048ab199cba1aa1c991ead8c7fd64546a7026ebeaa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 10644 bytes
font_01_sfnt_off0000c761.bin
e5b7902897dc3a858da18dd3be24705dc75defb56be26a40b3fab09580d19223		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC761 15316 bytes
font_02_sfnt_off0000ec27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 16792 bytes

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