Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebec4024c6187062…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 17:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e150827d5dd0767d156f29e1666042e SHA-1: 6a4acb8ce2c2ab54af86c1c8a9ec57d56bd7f98b SHA-256: ebec4024c6187062f6418d58e5f39bc7c4b18256ea7dc5cc1dab05f085f8e3aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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
  • 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://chikatere.com/Upload/files/35530506339.pdf In PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/detor.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/wadopigikozitajusumatoput.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/59156485849.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/1687591156.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/83692311282.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/jeduna.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613513ad80b10.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/wabetopupaxikenutikuv.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0385e860---bakejadiwibugopofibidelox.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/73805950911.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/15204244366.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/8213341681.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/nofok.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/8537581721.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/nekopakumilumujep.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zemilotedawekuwokeragiw.pdfIn PDF document text
    • http://aprt1day.ru/file/77784775279.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/22929605543.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/lamapojidilevomakatufepof.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/nezovabegiwomovoxevukuruk.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614076440bd26---84328215435.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/69054111288.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/marilafuwi.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631319121.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/koxunilafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=21+bridges+full+movie+online+freePDF 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_off0000c03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03B 16532 bytes
SHA-256: 5863801a3398ccbc443bfaabb157ca3193480a87ea5a3a21dabb54a94c873982
font_01_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 10820 bytes
SHA-256: 4da385e1962ef59095719797fd8d770f19ae78bd33dbc6c0d45e693d71bd944c
font_02_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1