Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b95fe5b220cdd3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 04:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42550d4c660dedd67ffa842bfc7dae5a SHA-1: fdbcb17df09d45be678793a73f0aaf52675cc89b SHA-256: 79b95fe5b220cdd374cb4903646c156fcb90e4c238b11c3a5b76ca26880e1cde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristics point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://youkuvpn.com/upload/files/22378712749.pdf In PDF document text
    • https://farsiherbal.com/cache/fck_files/file/linaborik.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/pijosekowosezazed.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zewivikirobos.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/79424507891.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/misibepu.pdfIn PDF document text
    • https://andhimazhai.com/images/files/siwatixolag.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/17350541528.pdfIn PDF document text
    • https://blugarden.eu/file/lujezulodavanipa.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/61711333587.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/36883745376.pdfIn PDF document text
    • https://soechi.com/userfiles/file/63840387731.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lawevapifilozasulige.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/pavudobitapo.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/vewixofexamisarijesexebal.pdfIn PDF document text
    • http://master-vin.ru/files/file/tonulimulidu.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/20721724970.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/37657223907.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16141057b1fcc7---maladizirugodu.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/54416598949.pdfIn PDF document text
    • http://superbarter.sk/media/file/vudinawujezilajilewot.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/94098504593.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/11710351757.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/73509492311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=all+goal+apkPDF 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_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 9804 bytes
SHA-256: b2b4d044e12f1b9cf427f14e29cfa6d3a75678921d511abca7fa1f93bd74c674
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 18760 bytes
SHA-256: 3450cde0834fba0e771c1bfae77ed9fd75af6e1345a00596ec051888f8213929

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