Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b5b22a29092ecb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 03:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c385e5bae110cc9cef0195adfc9f4a5 SHA-1: 11e5b5ea232d2808900dcf809a5a736c961fb83b SHA-256: e0b5b22a29092ecb55405f0d8245cf54db3af9235d14ef43b3b994de0b17ea63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external PDFs hosted on various domains, many of which are flagged as suspicious or unknown. The presence of a 'download button' heuristic and the ML classifier's high confidence score strongly indicate a malicious intent to trick users into downloading further malware. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mn-lawfirm.com/box/userfiles/file/31141695524.pdf In PDF document text
    • https://indobaliart.com/sitefiles/file/44397899650.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/nifituvovuzitazevujufubu.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/bopijebixokerixota.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/68566294759.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/53903328403.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/97433265470.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/niwowulusakafep.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/mivibopavasowive.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/konagozusizosepekonopi.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/lowunesikevekasatax.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/13339873460.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0f05cfc23447ee9f882de3b8ccffa7b2/terosener.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/91558169909.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/kerutabagukozusiwufegeje.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/68058941432.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/pedibidatisawusuteliz.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03ee66ecc---3684226918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=oxford+advanced+learner+dictionary+free+download+full+version+pdfPDF 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_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 11104 bytes
SHA-256: 8e87e0aadc711860904ac56e547eeb5a57d57f4d71eab0a819c563891d2551ed
font_01_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 17716 bytes
SHA-256: 597188831fe9cec77ef729efaa91a69f9291df4e075decefcb6ee4bbc89396c0
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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