Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b44b45b98c011e9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 22:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee0fbca1c757e2dd041d77ab434a9a31 SHA-1: 87dc6d384b77afec48952d1e9f281c3a9cb965c4 SHA-256: 8b44b45b98c011e95b7984c6d48cbae4eeb1403b97401850e7b71e9b1032fe76
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, with high confidence. It contains an embedded JavaScript stream and numerous external URIs, including one identified as a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fiscalonline.eu/app/webroot/files/userfiles/files/78665470490.pdf In PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/26678603788.pdfIn PDF document text
    • http://boldogelet.hu/media/dikiw.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/92686663579.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/depududuferozejiboman.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/fafulelobip.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/jamefulilipa.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/20918660223.pdfIn PDF document text
    • https://ahha.az/userfiles/file/92990540662.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/zewuwewabasubexixije.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/fowifadotovegurukofobosus.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/34921434030.pdfIn PDF document text
    • https://ancoraeducacion.com/images/kubinejerokunukapezewi.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134736264089---48147821235.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ab34893e53d568851d5abf1bd945e751/begobanimokowit.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/sonefezumoboku.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/niwitu.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/tosukumulamuveje.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/5431654781.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109052334465076.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/24380784044.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/13512014857.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/vawamaxogusakasutemabewo.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/jebaloxiroxofu.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/zaniwekopajawinala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+harry+potter+order+of+the+phoenix+freePDF 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 19024 bytes
SHA-256: 32c600057a5f3d3dbe08ecabc3e4eda1f82728df17781a8535d029f46d7e7721
font_02_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 10712 bytes
SHA-256: dfb14213c0b3a26288bb0337101d8092aa266a34055f168671a29517c84e1894