Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50a7b91d51a4213…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 19:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 42200d702b42bda3bd85578b3feb55aa SHA-1: 5aecb52a73d7956e24a57e25230e4e4efd176c7f SHA-256: f50a7b91d51a42139431889a13996c1f4023e10d7f43bea8ed2418363ceb7ebf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to further malicious sites or download additional payloads. The link farm structure indicates a deliberate effort to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://newchat.xyz/js/ckfinder/userfiles/files/5177689361.pdf In PDF document text
    • http://dienvietbac.com/uploads/files/tidavuzofoj.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/17521750265.pdfIn PDF document text
    • https://led7.ru/file/61235563218.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/83355438156.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/fugiwoxutujev.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091413504480554.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/tebilofekogidabedan.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/70943732962.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/74772534569.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210907053127-23044584896.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/96708166722.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/39234960026.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630554805.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/rugelogaxix.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/pisukaduwix.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/nitefilajaputozu.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/movopixalafexa.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/54966542049.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/vikumimosinatar.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3b7e466bb40527626932815f764a1ce9/wojituga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=percy+jackson+and+the+lightning+thief+book+online+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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 17656 bytes
SHA-256: 87f784de4f25a949cb27d3880065b2fbba2b6c6353f4828de499ee41dee0c5ba
font_01_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 11376 bytes
SHA-256: 0a90b076e4e6551e74896a73b0bd7c95408ced7f0d739c3a2a8105273d1b4ec1

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