Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dbc8c83b98ed61…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 12:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18f5457913741132fb5bfce93fc86c51 SHA-1: 23c6f8ab3c0241415745e85be107077ec868995e SHA-256: e3dbc8c83b98ed611553f8e81f53593e5da9aa754195efde362e01e4e64e72f7
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) is a key indicator of the attack mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://raegcafe.com/uploads/files/tabodiwimekumilapi.pdf In PDF document text
    • http://motolargo.pl/userfiles/file/24337699214.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/59372395276.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/wanimujolex.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/kivujeriwivavawifare.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/dojogixibunogoraj.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/41819879688.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/57462827490.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/33071517889.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/61902092919.pdfIn PDF document text
    • https://geniodelweb.com/file/mesani.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/17126967325.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6f10562e---22107046184.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/44870303539.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/ponizulede.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/xopolisekopakedugasokopud.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/31517441376.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/jixojexinumoxapuzobade.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/xujesimarada.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/86049318574.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/xebosexanuzabidozoduba.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6558be05804e40c4026addd5fd92c66a/47989472481.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/86043627726.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/59643309341.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/tidowuxewaz.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/50541538516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mini+militia+mod+apk+for+androidPDF 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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 18380 bytes
SHA-256: f3a71a872a322a6b27157b3fef8dc73a728241c192bb0908e3b4b65fafdbecd6
font_02_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 10444 bytes
SHA-256: 2d39521cc4437ccbf6fb6d1ac22e16b2fef8fe105d78e072d00bb9c738fa4d76