Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ed66b6db66dcfd…

MALICIOUS

PDF

93.2 KB Created: 2021-10-06 07:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fe3359c04f0562ee4acb70f438f71ef6 SHA-1: 4d81ea641a700e4c8ef8dd93692ac94ff509e16b SHA-256: a2ed66b6db66dcfda24394028a3ed83b165900622a552377cbd97fe8178f9bba
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript suggests it is used to facilitate the redirection or potentially execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=constellation+with+10+stars PDF link annotation
    • http://debsecond.net/UserFiles/File/bixivoxoja.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/54131061585.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/85380614782.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/31523640104.pdfIn PDF document text
    • https://vientangluc.com/upload/files/17557255461.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/befamudukulizujoguk.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/67876818571.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/98740568314.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/lutowek.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/dogizadexem.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/23648870604.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/gisebifaz.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/24338920993.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/redaluvafav.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/lelajage.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/rutifeb.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/vazosapurikinewuxefeweja.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/faaupkd6c7feqo1drpjeuij655/jodububaruwamasuwidu.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/76223952236.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8bf89b565b75223e68714aab0a0d807d/20101959873.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/62841181380.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/21343834227.pdfIn PDF document text
    • http://land89.com/ckupload/files/piwebubufefivigevopi.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/gipegefenixekej.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_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 19688 bytes
SHA-256: 06989b6384b5034b70c7718a4f914756b0f17d497cd9d30851f8d1f25d20a25a
font_02_sfnt_off00014f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6C 10496 bytes
SHA-256: a4757cd916f5fe9a2855db7822981432d688c4024dc686e128d49d58f6cc2766

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