Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58584a1785e5065…

MALICIOUS

PDF

95.4 KB Created: 2021-09-20 09:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a97934e33e3f5e3984522e89e4abfc4 SHA-1: 3542fff6c9fcd89676b28ef5c4ca12e3e03255d7 SHA-256: c58584a1785e506587dffba28f403ffb9448a354e88fbff04d0ffba148a6ea44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable hosting and appear to be part of a link farm designed to redirect users. The primary malicious activity observed is the distribution of links to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://coretry.ru/uplcv?utm_term=increase+free+instagram+followers+app PDF link annotation
    • http://ageofwonders.buka.ru/sadm_files/15770128472.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/47309008905.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/bamebadimemajadedumevefi.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/tipiziwodowubana.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/lemonivuvezugetovabiba.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/vinajekumow.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/25129519091.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/xewabofez.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/levuzoxirufejotazetabu.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/42232196872.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/tetunanitob.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zovilirilekuw.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/58567447500.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/dimepepesababinusuj.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/sewijufakisivofe.pdfIn PDF document text
    • http://ipublicity.cz/data/file/52173290744.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/19988278505.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/85319130876.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70b65e6e9---vejagasejago.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/64133438714.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/maritabad.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/87183766485.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/kopim.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_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 18416 bytes
SHA-256: a3883b0ef447baf1abb944d785cabb542ce616132bcf320ba7a0c948a5effcd3
font_01_sfnt_off00013eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBA 10860 bytes
SHA-256: 271ae8fb6290a1a9abe56395a01f5b986c2575159bf698910d5da69f0d885e5f
font_02_sfnt_off000157dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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