Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f17e82b87a7ae71…

MALICIOUS

PDF

102.8 KB Created: 2021-09-09 22:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a36ca48f728dd06e001b4d94d51a4d61 SHA-1: 1c75ed7538b64902400b54a678bae45111d2055c SHA-256: 9f17e82b87a7ae7147a712c4e78a46d898bc62f842e8e7ebb602e21920d10627
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=tintin+comics+pdf PDF link annotation
    • http://print-resource.co.uk/ckfinder/userfiles/files/sifuwenena.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0a6571d39e92dfdb8d82480ed08481cb/posimimob.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/dikaw.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/66060549201.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/sekusariruzobizisafogu.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/11300324382.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/wekamemut.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/80339665896.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/55999544648.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/62796262990.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/pokewajosixoput.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/17995201603.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/22205151473.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2i2elumdslp3pmd33d87074v85/zovupume.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/nofogopevitosobaduno.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/lisalis.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/rusikerukisuketuzi.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/balifelubatovuwa.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/wurunimujarefuvekemor.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/jajovuda.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-02/images/files/15441272499.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/57231779106.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16309469522064576297.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_off00012be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE1 10304 bytes
SHA-256: 01c3d7fa9863263c7b249a6894ded8ed04205cfd4f94e94dda911ef11a40580f
font_01_sfnt_off0001430f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430F 19736 bytes
SHA-256: 1688fc52f7bd121a8bb32d8dca00c13d45405d05be6fd5001566c440fb8ba40e
font_02_sfnt_off000175d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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