Malicious PDF — malware analysis report

Static analysis result for SHA-256 274b5c1d4f189b2d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 23:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d64b88aefaed4cd929ba3cb5a3897d9e SHA-1: d34d1a3281f1f4d5ec46951b186723f08063aff0 SHA-256: 274b5c1d4f189b2d9a14f1e9d6d2ad5f5ccb258b0e2f97c36c0feb349a64c372
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute phishing content or malware. The embedded URLs point to suspicious domains, further supporting the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=position+time+to+velocity+time+graph PDF link annotation
    • https://inprovitparaguay.com/ckfinder/userfiles/files/kefoxibebuzenekugem.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/bivokufakuxo.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/jipufupizabamuwaluj.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/nejeretemafogalewen.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vmbuuqg9mtpduhvmopalscccck/69404251908.pdfIn PDF document text
    • https://plasy.com/uploads/file/rudobokowimo.pdfIn PDF document text
    • http://rld-carbon.ru/file/15902539086.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/7739251084.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/19289807092.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/27035723551.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/pokegixivewamokofe.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/80488319354.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/29759874376.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/61173624696.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/kakekepegojomedabunugo.pdfIn PDF document text
    • http://jfe.hk/userfiles/92713513739.pdfIn PDF document text
    • http://blgjad.com/upload/files/16184888424.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/paxefumopobebadapogafab.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/bidimujatiwuxadakapawuw.pdfIn PDF document text
    • https://parfumzone.ro/files/file/zibuxibipinerejegix.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909032215.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/21967379070.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/jejagud.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21fc26246---53816302126.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109080551475719.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_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 18296 bytes
SHA-256: be58d0fce85dfe9e4e63051e1c86f43749bc4b6fe3af66cbe29aa43bb2f877ff
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 11000 bytes
SHA-256: bd044255210e74ef5040b417923a4d19cc9adc6532e1d56d84836d250589ad3d
font_02_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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