Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fab1e1ed4567e7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 10:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae1bae8edcc8ab17ea73d8eb0a0f74c7 SHA-1: 90c924ccba20b796dd7fe3a0456bc80fcc95058e SHA-256: 97fab1e1ed4567e7201bcfebfe8b5fa17e9ca3be537332f413fedf08b38e1b57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document contains numerous links to potentially disposable domains, aiming to obscure the true destination. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cbstav.cz/file/57426066547.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613867f11ab81---43545803969.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/fivibowomodeximovazibafo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4bdeaa82---foxabipunudekezulufu.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/66406324732.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/36842580243.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/21443671332.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/vosavekafetufivebezesaf.pdfIn PDF document text
    • https://aromamarketing.md/img/files/61993199351.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/42172062407.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/90806147364.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/82301486255.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/pivuzif.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/ruxamumi.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/vifenagukanowijulisoso.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/latepesa.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/jukodupuxavubotuzunevom.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/51482971335.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/94731442540.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/xorabuvatojixoba.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/togezokigobadifabub.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/80663740253.pdfIn PDF document text
    • https://majubesar.info/contents/files/wemezanudixoxagabatolewup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=message+blocking+is+active+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_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 18496 bytes
SHA-256: da10e9d64db3768be7101075c3e6b7898de491a826f38a19c33be4684bba759e
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 10836 bytes
SHA-256: bfdd2d8f0b10cde4d13514c045dcfb7084e8d391437f47b2dd45b40dde386cfd
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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