Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4222498c271dbcf…

MALICIOUS

PDF

70.4 KB Created: 2021-09-08 21:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12b834f1b193749336809af2b20cd567 SHA-1: d75e2cb42d58d7a9140b30e35d66a8df64106aa8 SHA-256: f4222498c271dbcf59457a0f8dfee37015cba71970e2b6e1d5b8cfd5d3fa3e6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://catamma.ru/uplcv?utm_term=gujarati+language+android+mobile+phone PDF link annotation
    • http://erodiertechnik-wenzel.de/userfiles/file/tawizivelefonumepoxaxaju.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/vunewigolupemaribibut.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/84721000511.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/ninoleramukumumoju.pdfIn PDF document text
    • http://emeat.ru/var/files/jutusodake.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/52217890267.pdfIn PDF document text
    • https://fond.ru/userfiles/file/77440550846.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/32211243543.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/95792051530.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/zuxezas.pdfIn PDF document text
    • http://minhanh.com/files/19578658507.pdfIn PDF document text
    • http://packturf.fr/files/gidik.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e0918de05ef42d3f2622c241943c62de/53058808283.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/1455986063.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/39187144350.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/torakej.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/29003014618.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/55879835986.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/potenudanukoxakex.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/ritipaginovovari.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/gonopoturivomujemunu.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/76735624822.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/53870873215.pdfIn PDF document text
    • 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_off0000b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 11080 bytes
SHA-256: 0617bfa2c1efc3e072207b780e5e23cfdbb3567271ac594cdf9ca056765514eb
font_02_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 15944 bytes
SHA-256: 31f12bca52cdefa08e10fb31a34a1fd8b512bd387d23e991dba92d533a4db771

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