Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfad70971772241b…

MALICIOUS

PDF

67.7 KB Created: 2021-10-03 21:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ca12f47e35bbdfb051a304a10128919 SHA-1: f7e826fd58331ec2f6127e56d51c750071928644 SHA-256: cfad70971772241b5c072aff07c07118e20e5a38ace02bee8bce93290e7261d1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is structured as an image-only document with a clickable action, a common technique for phishing lures. The ML classifier strongly indicated maliciousness, and numerous URLs were extracted, many of which are hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.gonouvellezelande.com/files/javidarakosuriraroxi.pdf In PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/zakerun.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/vipatodopemuj.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/bukogubewikawed.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/toxinojiwilojototiv.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-25/20210925142838661253.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/ranazezakonifizuguroda.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/60702785056.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/48406001241.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/46606971904.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/12386294844.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/49381335608.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613290336a57d---venobiwab.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/51288728089.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/wexawokipetojone.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1615728c43dd60---54313399246.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/papejavixopisarisuta.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/ligulenuxux.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/14958618970.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/girile.pdfIn PDF document text
    • http://entrackintl.com/uploads/xujajupifugome.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/vifezanadogugube.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/77634850396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=class+12+political+science+chapter+1+the+cold+war+era+notesPDF 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_off0000ad1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1F 13892 bytes
SHA-256: 1496514fde3d3ae207ceb66d292ccb1b926c05ed8bbd192bae4cc2357d788df6
font_01_sfnt_off0000cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 10900 bytes
SHA-256: 190d45218ff1208575388256d1196f06e6a32962868b0be85f20a7f96c2023ff
font_02_sfnt_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1