Malicious PDF — malware analysis report

Static analysis result for SHA-256 5623cf8137c0f9a0…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 07:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: d270daf6466ae5a40fc622f50cc75469 SHA-1: 9f0d66c0bcda1cca09a5bf96b4e7aaf8add4eaaf SHA-256: 5623cf8137c0f9a059d6c4f7734eed2a8060d2235412d21090e7d465c1ed480f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests the PDF is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination by using many distinct hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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 https://ketchas.ru/uplcv?utm_term=change+always+to+just+once+android PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/elnmahcu5d74r00dhvjhtbqgn3/bomijawiwifibuzovujosoj.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/lefofizaluvapapanejeb.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/90532951398.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/19299781136.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/83327700596.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/sunoriwiso.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/27795079490.pdfIn PDF document text
    • https://nistd.in/userfiles/file/823160244.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/vomawikis.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/gojuminukute.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32338750---60845355289.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/55845356294.pdfIn PDF document text
    • http://kccmaul.com/files/files/nazosesowazafekuvuwutaw.pdfIn PDF document text
    • http://lj-group.cn/upload/files/mojogubimi.pdfIn PDF document text
    • https://kaisar168.com/contents/files/fejazamonasabedezusabus.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/kejowabibebi.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/kixazejekajotofum.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/38830982222.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/41690428298.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/84769998823.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/musofan.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/79384662958.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/71288631805.pdfIn PDF document text
    • 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_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 17856 bytes
SHA-256: 92f0b99566af8650c7a332e916de13390ed8c3fb852bd2bc605a02db25545ad4
font_01_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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