Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbb8f80d1c4ae45…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 03:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0f6046190df67f96efb75f0830c130d SHA-1: 2eb4fc1569e7ef88318b36afe2399de266fe2586 SHA-256: 1bbb8f80d1c4ae45090aa3d70aed85d6073b840453a2f124970f4b0dce315006
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://ryokanclub.com/FileData/ckfinder/files/20210917_F3C461863B3D3269.pdf In PDF document text
    • http://sro52.ru/uploads/files/59300524697.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/begegomiwi.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/47602315387.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a77c22a4---7603340120.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/lizegefisijop.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/vafaropimenufejuzolowofip.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mipipado.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/notutakovis.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/2104908684.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/bexapazif.pdfIn PDF document text
    • https://wittnebel.dk/file/duzilotozazopoxepuzu.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/1921985783.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/fagojudeji.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/94452644932.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/diwexaz.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109122306419192.pdfIn PDF document text
    • http://charontrade.hu/data/file/ragofiwakotuzogixasoritud.pdfIn PDF document text
    • https://onlinendttraining.net/files/21490909085.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/53949553082.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/51193635869.pdfIn PDF document text
    • http://telecycling.org/files/file/5400150931.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/12463994921.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ddb68b83---daxenogosunikozatowom.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/15431318212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+assault+rifle+fortnite+save+the+worldPDF 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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 10756 bytes
SHA-256: e25c4d45bf2f7ed91ca2922e649686fa4cd1af311a2bc1578e83c29c00d2ed59
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 17792 bytes
SHA-256: a5c5e9e19bf26c08d448d0662521ba5164bb5489e7662dd468e9fca6799dd2b3
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1