Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff133265104916f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 18:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 603dfb8a99811513ecd97cd451a2333a SHA-1: 1b084b082be18a66553f1d0012ead9a592868aef SHA-256: fff133265104916f34af119d2c2ba947905e3cf75921f6e3a576928a5149b34e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to potentially disposable domains, characteristic of phishing or malware distribution campaigns. The embedded JavaScript likely facilitates the execution of malicious actions or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://letresorellebio.it/userfiles/files/nubulewedilumuxuvudorud.pdf In PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/37410679872.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f837c995e3---jekuwozomeniwoziruki.pdfIn PDF document text
    • http://lejuriste.ru/files/file/76984424028.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/12634151900.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/93307010346.pdfIn PDF document text
    • https://nistd.in/userfiles/file/fimazoko.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/tigem.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/piloxupuminawumefiwaga.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/9798035796.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/tenaven.pdfIn PDF document text
    • http://moristas.com/userfiles/files/texixenuson.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/4291715475.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/71181306454.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/satebimamenegarom.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/pinokosufujowiwalamega.pdfIn PDF document text
    • http://unityproductions.com/upload/files/zodiforegijeju.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/vapotedibunopixomos.pdfIn PDF document text
    • https://teamcode.net/upload/files/nebirusafozojivafi.pdfIn PDF document text
    • http://kammed.com/userfiles/file/julamoz.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/gilepewakaga.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/nonanasasamezamete.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7r2lu5c3nvpu05muemrkfrlfr6/53718985143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=periodic+table+fill+in+worksheetPDF 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_off0000bbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFC 10892 bytes
SHA-256: fafd722404b47d87150b17c540e5636b6c88d914ae7bb57a968d67ef96724128
font_01_sfnt_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 16332 bytes
SHA-256: e166645d94f23913a1d675673c96c3ecded1c3f9ec4e8e0c1b1d9e56cbe48a64
font_02_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1