Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebdddaf23aa9386…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 11:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a954e352c6cb1af014a57b1be883a25b SHA-1: f25f6d22dd298a4bf0b479bad3d3c5e91e4f6b08 SHA-256: eebdddaf23aa93862b2bc8c50815499ccf22e62a8b276b2deb4b52661690d0fc
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true destination. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the PDF is structured to lead users to external, potentially harmful, websites. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://www.sudicobank.com/ckfinder/userfiles/files/10893393280.pdf In PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/xodakafosabakef.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/tiforewusawo.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/98293188711.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/87792604474.pdfIn PDF document text
    • http://tradotel-riviera.com/file/31103790477.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/63079084754.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e19b4d3bd3---19695664857.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/kivisawakubiwizoj.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/71420090661.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/tanirifajejop.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/vejaworajox.pdfIn PDF document text
    • http://cartopack.be/Images/file/wafuriwelikonigafaxuwokud.pdfIn PDF document text
    • http://vln.nl/files/file/67798826427.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/sexekibesopodubug.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/sejelakamigowuxenimodope.pdfIn PDF document text
    • https://pacificengineering.co/imagenes_cont/sitio/documentos/67014244697.pdfIn PDF document text
    • http://flirdining.com/uploads/files/58427321721.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/80179100366.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/58389601597.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/46178627515.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/folopol.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/xanenolofisupezipaso.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/lizupetok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=stanford+health+care+antimicrobial+dosing+reference+guide+2020PDF 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_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 11480 bytes
SHA-256: 9b4f9bed60c2b22dbd8929942c6c96d607b128a21337538451f7aeda9c47cbc9
font_01_sfnt_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 15752 bytes
SHA-256: 2374cff3936c9d5321bec01405cc30f60f54eba97c8717a563e35e590f9c0231