Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5df644bc9987d11…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 23:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07550ca39b52d5eb74f4c6ca408dc832 SHA-1: 83c9f04ec398f1ec9027da4e8c6941dd1798fa54 SHA-256: c5df644bc9987d110702f5114b5f6901643ef5249230b2aed3bedcbbf670213d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. While no scripts were directly extracted, the presence of many external URIs suggests an intent to redirect the user to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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://queure.ru/uplcv?utm_term=android+11+update+release+date PDF link annotation
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/gawel.pdfIn PDF document text
    • http://z500.si/files/65917787613.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/27923551198.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/92824636060.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/44000888298.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/77955023939.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/topidigilugonajixa.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/xedepizurizotaga.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/97704455335.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/pafoxalawuzigibaseduf.pdfIn PDF document text
    • https://aneri12.cz/res/file/dejajanekuwekozerijiroj.pdfIn PDF document text
    • http://blueyee.com/upload/file/070746546243.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/79739647832.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d1e7ebfa088d7c7f3cbf4ae8de15245d/zugesiromatejanosipofa.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/21372739294.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/rimitekirofefewageliwon.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/89336169625.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/zeduxupupiji.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/dce4ifu7ftpb62eilf09o747s0/zetedofuxomugogi.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/pivilurajigitilatidu.pdfIn PDF document text
    • http://panova-art.com/files/file/vuvotezobezigikadar.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/lamanijatakelazefatuzo.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/39777137502.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/83369446832.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_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 10520 bytes
SHA-256: 4ccaa3c3ede55aa13323ea0be58e3296480cf55562d99c41adf2b0ffd0733fd7
font_02_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 17860 bytes
SHA-256: 9f16b5d8ab0dccc125144648e9cf0b740e7e8f080e01a3673d87297cbae5929b

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