Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c92c54aaaf71e05…

MALICIOUS

PDF

83.0 KB Created: 2021-10-10 18:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dbac04523ea70bf1075e971faf82bd45 SHA-1: fbce7f253f4614d1812e634a852127682b853373 SHA-256: 2c92c54aaaf71e05ea483fd9ff4e4b96da8af9f0af568e1c863f7964083c6799
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of malicious redirection.

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://oniceh.ru/uplcv?utm_term=minecraft+paintings+hd PDF link annotation
    • http://image.dlib.vn/libedu/news/bachviet/20210920/file/nunasukede.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3500274faad953ec60c566578fea8243/rituliwowuv.pdfIn PDF document text
    • http://logicamail.it/draft/media/69805825476.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/46844744965.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/fofolalovitoferulopabufur.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/75252769150.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615616ab6f5c2---vagitebasetazogig.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/tinodofufatupabusakax.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/zavusiziduduk.pdfIn PDF document text
    • https://jensbrode.de/files/file/74376128245.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/riwetiginuwezoxogawenagi.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/11198367784.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/49672145054.pdfIn PDF document text
    • https://arteziano.ru/ckfinder/userfiles/files/fudobekurufonefi.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/18434979769.pdfIn PDF document text
    • http://grandfiltr.com/files/file/mizanol.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/29334516354.pdfIn PDF document text
    • http://caratow.be/userfiles/file/38948234095.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/kudexibonope.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/76007698884.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/kidudu.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/26174718694.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/pedobosojen.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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10728 bytes
SHA-256: 764e9781944c1f99c969651d193db41f2fbb47fb8eb524cd7a2685901cc71528
font_01_sfnt_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 19764 bytes
SHA-256: 1e23002827bb23d234770a613f45b0165a599a7ffbea3ff266cb9b4676d69e19
font_02_sfnt_off000126dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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