Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bc3b3a5a09b978…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 06:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b8d92771ee1e4ddddbc8750426b6cf08 SHA-1: 7963d03c3e12ea139e12e048ac78bee62dfe4fa8 SHA-256: 92bc3b3a5a09b978a019401bdbcbc311f89e0329e133bb72a4451e9b3e997b10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://susasoft.com/upload/userfiles/files/83959416814.pdf In PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/71711653189.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/vobusagipapabojogogix.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/tawap.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/70532058269.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/jikoxasinasubaleb.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/66594805267.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/23708078073.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/mipigegofesomak.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/78c134be547b906bda99212f95ada14c/sosimapirewuvu.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/52246773496.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/84461901704.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/7819137623.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/fidukapemigokuwav.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/39534879815.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/2359415200.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/27025644407.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/gifevujirebowagovak.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///52591646577.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/mekunidol.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/2988705708.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/magafoxomixagalo.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/40941034243.pdfIn PDF document text
    • https://thietbigas.net/media/files/mabavemefawo.pdfIn PDF document text
    • https://wmu24.ru/media/file/godumolidiseposujufiwisin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+get+gps+location+without+internetPDF 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_off0000b047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB047 10960 bytes
SHA-256: 69018108f4d55972307b1ac9f6080323968a76f0b1c21a23a4d5b256d84f7d76
font_01_sfnt_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 14720 bytes
SHA-256: 1ac202075c1ebcb751251446a7290407d0998ae6a3fbfccbe1c6a5e6123ecb5b
font_02_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1