Malicious PDF — malware analysis report

Static analysis result for SHA-256 92df4b5537c148c2…

MALICIOUS

PDF

73.3 KB Created: 2021-09-29 05:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0b2cd1cd6866c9387a99478410a888f SHA-1: 2ad1416083dbb1c02eae4ae51238d76ccc0068cf SHA-256: 92df4b5537c148c297c86fffc1d6993414c4466a300610837f41f04614fe9760
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to direct users to potentially harmful content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=headphone+app+for+android PDF link annotation
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/rukegusexobowowipi.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/jumulagavixatuxor.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/971487289.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a901a6968---47371579191.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/73156562232.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/39832979320.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/kujalilupixifidofo.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/padogudiwaj.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150de017c37d---wopuselasi.pdfIn PDF document text
    • http://poultech.net/d/files/zobigi.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/jidixon.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/55206235406.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/69522178833.pdfIn PDF document text
    • http://heyratacademy.ir/file/23141090438.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/70597232408.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zojit.pdfIn PDF document text
    • http://vititanon.com/user_img/files/81381361929.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210919_105427.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/78885355062.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/86312341021.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nedewetuju.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/49383162970.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/misazalob.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_off0000b809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB809 18836 bytes
SHA-256: 774680baa25eb44b6d013794c9a5e191fd8131aaebdfe8a26546aaccde36451e
font_01_sfnt_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 10272 bytes
SHA-256: 9bc99562f26a7910791435f6859abefb176278ba60ab35f35091d881f2adae6c
font_02_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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