Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c13b7f74bf07ea…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 20:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab07af1f60b2d17f9eb5ecb6431b40f2 SHA-1: abf7783899304bd84ff1530d9e091e1e734d778b SHA-256: 31c13b7f74bf07ea9f6ed5a720e45c51ba6552ca8ce8e932efac05428da26b56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to unknown or potentially malicious domains, suggests a phishing or redirection scheme to deliver further payloads or collect user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://ekransamara.ru/files/lelawerusolabefumoze.pdf In PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/zurekojozosamevaro.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/73795276058.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/3389596642.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/tuleg.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/kijivozogifopazusinobomum.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/2840294378.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/memaliriw.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/34372928439.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/10728061426.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/suwexa.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/36985300149.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/nijikutigodevexodusina.pdfIn PDF document text
    • http://airfa.it/userfiles/file/15705835020.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/getosovuzasoxag.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/10496265975.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/kowikajisutuxipa.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/pajokoparijujivugemuz.pdfIn PDF document text
    • http://imi.vc/upload/files/31950599873.pdfIn PDF document text
    • http://mamitobe.ru/files/file/bubepovigitadunokezoga.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/bililozovafutitajuwedoni.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/vajemasazozesemisesowa.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d1c91d541457515289dd4dce736439b7/25809055858.pdfIn PDF document text
    • http://djpress.pl/Image/files/lidekibomafatowo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6j040b3n7udtohemqm7072s9ll/38937673184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=afrikaans+magazine+pdf+free+downloadPDF 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_off0000b7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A9 16324 bytes
SHA-256: ae9e519157c785e011d7e0ba4e6ddb1b1be96b369eb4242b038b09a78d1ec9b6
font_01_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 10960 bytes
SHA-256: e8ce6cab84aecc33015aff167b1f4f98ee94b396fd2fc35c6ec1f289d326afb3
font_02_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1