Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebdc95a05fc6446…

MALICIOUS

PDF

68.7 KB Created: 2021-09-13 06:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 9b4471a4e039e1136601a9b911f7832e SHA-1: e1866bbd2b36cb7f793b5c76c06c523139602f58 SHA-256: cebdc95a05fc6446a27c0428e42318776d27b7e8404e3cf7e44a6ca578fe3f17
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://eg-connect.com/uploads/editorfiles/file///20876107142.pdf In PDF document text
    • https://medtek.vn/storage/file/jewidil.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bubaj.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/35225470302.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/vofodovitepuwepemedi.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/liditefesetutigodelimat.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392fe6d7081---miwekitukafutirol.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/kuzokejojexot.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/nujakepatevedakuf.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/64461492478.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/milulorodexipemuvib.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/97071951652.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/10696723791.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///tezepolazekexo.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/10678397824.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/relobumutebofaselel.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/15921598471.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/45224805860.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/6802756875.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e89e75324b---4867326517.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/55486102356.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/rejulojupafivanaw.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631221863.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/16957631504.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/27589883544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=app+penghilang+backgroundPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 10840 bytes
SHA-256: c7ba78357c7ba5f69af7e6b65118e33183e9a9a3ef80a4d991379f89eb643a5c
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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