Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfe8058cc86b644…

MALICIOUS

PDF

74.6 KB Created: 2021-09-29 00:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 89062bb7b81e5744aa1906fd1acd9a6f SHA-1: 3fdb746f69a6c695b71708d9bc6c4da887571045 SHA-256: bbfe8058cc86b64475266f4ee65ff12263fc280fb56d11d39cdd39b940d4145a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being part of a link farm designed to host malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/pabobujukelaje.pdf In PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/84251885957.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/pomawe.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/24478044291.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/ruxoja.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/5gre2sl139ur3amsot3nsghh43/7095103200.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/86418085879.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/29851216929.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/wutumukewajazasiganepiga.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/9488845884.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/gotadeliwesabemudon.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/3494752825.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/vobaxodexa.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/97421021371.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/gamejutomur.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/notofufa.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/46893528596.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/87597064608.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/zewafonasoranoruxesudobo.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/jalemozexodoko.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/razekila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sans+simulator+free+playPDF link annotation
    • 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_off0000b926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 10808 bytes
SHA-256: 0bd96e811b59bfb4de96aa1dcc624c2dbb94fc9a10138ebce057fce25fcfd628
font_02_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 18768 bytes
SHA-256: 366df0905afcee929163250d3f7f6d14075d175ab8457defc8f7f01da74c5523