Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b02aa695e3cd8a7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 22:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 664365d0c8668728a50e89e54b414a37 SHA-1: 92bf7e1d628360d3d7abfd56dcad2f86e10bcf2c SHA-256: 9b02aa695e3cd8a70f714c38f5d30cd7203501c1f6b17db7c9aeac57ec26d422
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious content or phishing sites. No scripts were extracted from this sample, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/lsdqu5avumq28apnsru7apomcf/7037416153.pdf In PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/81625816783.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/xiretawomiluxolapisare.pdfIn PDF document text
    • http://precisao.net/files/files/bagorikidi.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/95331227605.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/47389413947.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/nujewowivegurevumififukob.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/40576499917.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89736178678.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/buzanutuvin.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/95046505107.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/39436539487.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/26772968569.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/lafexagamedupala.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/93137601183.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3cfc0584---88537368026.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/4197458486.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/kuzol.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/birigik.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/tizurapuxefukigusexud.pdfIn PDF document text
    • https://anfauglir.com/images/file/97276253094.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/9346830388.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/63706075486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bachelor+live+stream+freePDF link annotation
    • 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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 10616 bytes
SHA-256: e07290d3ee945df18eccee702bd9f5295a6a3a28e0f592488c268248b277fb77
font_02_sfnt_off00011015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 17476 bytes
SHA-256: 0c829481de474e83f53f520bc2f3c692026cb8d7a0b4094ceb4a99b72da57882