Malicious PDF — malware analysis report

Static analysis result for SHA-256 a808ea58c29d0e98…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 04:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bca630d35982898329db132cfc76b0e4 SHA-1: 447b8d559e15189491f67d927b98206ccf89537b SHA-256: a808ea58c29d0e98d9a6b39b545282a789556dc0ad5e476216e0f8dd7483d29b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains, indicating an attempt to redirect users. The PDF's structure and the presence of many links suggest it functions as a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=nba+live+16+apk PDF link annotation
    • http://2990592.ru/ckfinder/userfiles/files/23213716530.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/18767848174.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/39009645227.pdfIn PDF document text
    • http://foxhill101.com/userimages/16568326848.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/94630156812.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/1445116913.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/fuzadorup.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/jupajigunomogupoxokigusiv.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/7658377470.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/tojorewasuwolavi.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/59739949449.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/57374305746.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/kudebuwakotonomeb.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/zerojogebuv.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/gerapudif.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/zavusidofadi.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/42481696309.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/78290428546.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/91028233626.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/88fa17e157fdebed9209482e44c8563f/gibelagegitig.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/84618321991.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/16197801450.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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 17328 bytes
SHA-256: 308ab463fc6c10cd92f96501234fd8087c2581a515a83a71189951622adf7d99
font_01_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 10148 bytes
SHA-256: c2ffabf3b589e9be13447f1dd82d18d7fe1f946a2edebd1a0f9fc6ce7993a174

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