Malicious PDF — malware analysis report

Static analysis result for SHA-256 81507164bdcdfa4a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 03:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4ecfd72bab903e4064f80c345927d96b SHA-1: 6a41758a9252a31c959393aaae6eb001e7053c7a SHA-256: 81507164bdcdfa4a7ee7a34b2a000522c9ab4c22550afa2f4e49dbdcfd2cf5f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is part of a campaign to host many links on disposable domains.

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://nomylo.ru/uplcv?utm_term=nba+2k21+ppsspp+download PDF link annotation
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/77596854021.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/bovunalawinezod.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/27872463977.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/30002287478.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/labozepesidexuzub.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/sobosumosifa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161401709ec79e---57055579575.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/85395126324.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/momorikagoneme.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/popopar.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/77481805747.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1631469136.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/tijirobirefolakefibilen.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/14617682950.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/wedaturujedopilafefakax.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/lkd55t0aa3h09a8dc5la72vkh7/buvejonoluxegife.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/rakamavisuxe.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/74910843877.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/82090893353.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/dupilabusitulodigi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/5595987165.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/c9521d95e9c301e373aa897a4434429d.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_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 10428 bytes
SHA-256: a601b134994a39316c17ef8cdd03e94f49ea232c063cac400795c3b0a9a5b74c
font_02_sfnt_off00010cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 18328 bytes
SHA-256: bad79690ee7efb2f0a6cd7ffda6f7a29044a323df6792a4d31155d49a4955978

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