Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c79eb13e8b8af0…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 06:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3174e129f6686cd88d09789e1eff2a59 SHA-1: c69659b7c2771fb10c51fb2f9082f865f3cac40c SHA-256: 63c79eb13e8b8af0a6cf0ff625534da13d66cb25b26b1705221e36d1b211ed92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's purpose is to redirect users through multiple low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://cafehinglung.com/uploads/files/levubawilalugesawotatonis.pdf In PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/vusawafafafukepen.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/64936484126.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/titoziw.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/54184732477.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/wujemowajajerigufepijigo.pdfIn PDF document text
    • https://go2germany.ru/files/file/43251369140.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/libumixevikuvefosonizado.pdfIn PDF document text
    • http://capableapp.com/uploads/files/21445646162.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/91655859750.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/jejuriniju.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/tovorepofek.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/79815810076.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fuwiwunuvorenozixiriware.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/75312390509.pdfIn PDF document text
    • http://theponghop.com/upload/files/repojifulimew.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/tufuvobofar.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/gimijo.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/47455186393.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/tipoxavejipuwefef.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/70317045726.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/gutaviti.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210905145344.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/85243277139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=list+of+all+indian+idol+winnerPDF 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_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 10388 bytes
SHA-256: a5d0b2fa2b653557f6c7d2f4df345891b296dbfc21712bb8032d775cdbc25ba9
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 18144 bytes
SHA-256: ee2868fd2967d5c34720edcf0a68f7a0907cfde9f76612bd30e52a9b135c7acd
font_02_sfnt_off00013718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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