Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ba2bfb43085405…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 15:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2db91fcfe3644c804e73640a9241ef9f SHA-1: 8ad9b2c741e347e2369f60e318be27af821ff28f SHA-256: e0ba2bfb4308540525a41be7bda44c3b467bb451db95a9678101ebdb18405301
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://synerhu.ru/uplcv?utm_term=family+simulator+adult+games PDF link annotation
    • https://successalpha.team/upload/files/nugitimoxolanew.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/7309051381.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/81156493105.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/2316686112.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/tekafaju.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/85480758883.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/valamasojuzupi.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/vosolaxezilatanadizaji.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/jugasusip.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/55700127453.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/sonipogoneruwawivametaf.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/77416830321.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/29798888682.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/xodekasikapop.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/bomogofemuxo.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/96882153991.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314c6b1f927---61359520289.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/81200765399.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/xunidizazofabikojap.pdfIn PDF document text
    • https://olterus.com/contents/files/73851105992.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-19/20210919042008496631.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/vopegegotowasevusegi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/nbj0jcg7ljv30383ed5ng136e0/69580614003.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 17528 bytes
SHA-256: 9bc6a413759da1005298fdfd3d42e698f2ec12b9f119635d28de8c154945d579
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 10680 bytes
SHA-256: faa11f6623e2c61a56605d35c3f5a0535fb82892ae4c35601730642f68781a13
font_02_sfnt_off000122d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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