Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64238a50bb623e5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 20:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d58feca8f08107ddeefb27699572f09 SHA-1: bc9836ec5ee3ec0b6256a422f3137bba2eddf3fe SHA-256: b64238a50bb623e5c4736785fd9b5fce547488bc78117a7e49e0393932ef5798
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are likely disposable. While no scripts were explicitly extracted, the PDF structure and its classification suggest it may contain embedded JavaScript or exploit code to facilitate redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.sushmitamukherjee.com/fckimages/file/76286737488.pdf In PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/6704338815.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/77362198068.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/799647361.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/39057411787.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/23148499705.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/rubaw.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/bejamedexovutu.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/42593332712.pdfIn PDF document text
    • http://dsfly.com/uploads/files/44538516630.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/pegodo.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/22116011457.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/23276367712.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/7422236117.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328cb529d58---kodonapifisir.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/suduva.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/wevida.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/48573307158.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/68472571919.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/tomixewemidazinax.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/37664243917.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/nosuninuwasomoxoxe.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/59088498563.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/rugalagudotikuxadokotux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=can+tally+run+on+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_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 10184 bytes
SHA-256: 06e55d8e13ee811a196c1bf62cefba525351ba33bd3d9176d9ab86f8a56548d1
font_01_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 18152 bytes
SHA-256: 2eee486bb569bd07f81ed47810f8745610c53c92cce88880dd3a34f149c09499

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