Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe19541f49beb692…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 20:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db3a33bb007248093b543f1011406794 SHA-1: 838e05c19fa70bee3c610d4627503c1ed9179a78 SHA-256: fe19541f49beb69278f5a8167651dfb08fc986537778e52c937060f7ca51d35d
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on distinct domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://angelsforwarriors.org/userfiles/files/lofazerugawugojonoz.pdf In PDF document text
    • http://mazraeir.com/images/upload/files/24664584432.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/fawevewusajigekenop.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/zufilijokozakulaj.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/36403904724.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc56f2e5d---puvog.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613632441f312---rasagajar.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/gumufedewobi.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/34402383665.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/89378696363.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/84160562923.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/xakesebuzerube.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/jolizelevimiroziwod.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31613274728.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/66252071611.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/91831835841.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16133626a30a1d---vejutipanobil.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/lovamukilut.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/90847040773.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/jaxibaditiradijavasavore.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/34968401155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=game+of+thrones+live+wallpaper+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_off0000af4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 15944 bytes
SHA-256: 33bccb83889e9859844544036bf580e11ec6baa9ba0c60cabc2a1854396974e9
font_02_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10952 bytes
SHA-256: 72664c2870c1303c6ddbab8b32c2b2c4e299826831fd3aaa9636a642eb18ce90

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