Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc564a551bccdcf0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 04:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0e19e20392054f5cc31b0ae1a0178df SHA-1: 06ba002fc27988817c4ef6ab6b18ff5e6572f08d SHA-256: fc564a551bccdcf0f683f6cbbdc16a9434b2bf6f7d82f328e7fccdca672ac12f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a strong intent to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to facilitate initial access via phishing, likely by leading users to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=4d+moving+wallpaper PDF link annotation
    • https://xn--fiqa735be48e.com/upload/files/33228012853.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/nevoribunalipikejikido.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3df8a119---sawosukitizakigegaxu.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/kulofukemel.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/22136550449.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cerm6uq5pi81o60oc4rd035444/344785586.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/jikawovurelupunuxa.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/8242031999.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/57700202974.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/pikutedevazuton.pdfIn PDF document text
    • http://netart.hu/userfiles/file/zupowatosam.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/87997828147.pdfIn PDF document text
    • http://ubest.ru/images/file/zojuvuga.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/70093165692.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/nukafitusoninukifab.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/78089301289.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/jotupaxetabekuwetuz.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/soxabulej.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/56659973914.pdfIn PDF document text
    • https://777mto.info/contents/files/beniduvinuxukodopo.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/84877625382.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/nodikexugowawixebo.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/24659538915.pdfIn PDF document text
    • 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_off0000b102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB102 10604 bytes
SHA-256: 4df29e25800c8241d781377c744b81a3da35ba42bef4d8f179951cc0906fc98a
font_01_sfnt_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 15848 bytes
SHA-256: 88faf0e01c7194d59bd5f3f1ba50dc18155b7444a82b0742079393d22ab37252
font_02_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1