Malicious PDF — malware analysis report

Static analysis result for SHA-256 0956c3f6aea10405…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 10:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f1a3a07599bfa7870757bfbee31a6b9 SHA-1: ae8a5243e3b8dc5ec30063f74b9fa4de4f96568f SHA-256: 0956c3f6aea10405a63e7ceede8adc12c20c37d4b92e860c9f04ac1560098853
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to act as a lure to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.niceresidence.net/image/upload/File/filewotamesob.pdf In PDF document text
    • http://savvyais.com/userfiles/file/35885570946.pdfIn PDF document text
    • http://charontrade.hu/data/file/90723000988.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/40006796086.pdfIn PDF document text
    • http://zeci.nl/im/image/zitinudetawijotipi.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/rikilinaruzomutas.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/85394855216.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/jotaruwofaba.pdfIn PDF document text
    • http://hongdacable.com/d/files/72581114903.pdfIn PDF document text
    • http://ustunongel.com/image/files/mepawupovago.pdfIn PDF document text
    • https://wittnebel.dk/file/75133030583.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/78130547728.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2f05c115719a893a591db3c1073f1adf/2408542757.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/lutixerabaxa.pdfIn PDF document text
    • https://vitanov.rs/files/59548205452.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1b9ed318---rirafusenunezisotu.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/13/59825362412.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/zilunoponer.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/39389588806.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/33549666180.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/7966720024.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/5241045917.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/66417521266.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/sopironazujuliwezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=initial+d+ppssppPDF 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_off0000b74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74A 9984 bytes
SHA-256: 02e60fd18c9a0da4e86b21e19656f93791facc1f573597712f9be934beee11d4
font_01_sfnt_off0000cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 16500 bytes
SHA-256: d35daac91e9e036770d06800fa770905ee12332264be11d52f2d078c7c3bfab7
font_02_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1