Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e490a6838c33b9…

MALICIOUS

PDF

70.6 KB Created: 2021-10-08 20:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 009245aab7348b0e51d98d988c37676e SHA-1: 4dece9affa447b798c3da2186cec96388c92d86d SHA-256: 45e490a6838c33b9e8b870d4bea9ab806c6d4b1f95619bd24daf7437c6db7c0b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the overall pattern points to a malicious document designed to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=bacteria+and+fungi+are+example+of PDF link annotation
    • https://cytairtool.com/test/userfiles/file/20211004_7230b.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/kinotakiganowilewebavoma.pdfIn PDF document text
    • http://bamila.vn/luutru/files/sitipojineboka.pdfIn PDF document text
    • https://buzyhub.com/files/gevutezew.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/55267632021.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c48683ef5---41713432991.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/76183410310.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/nogipotadu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c9321329b8c325892253cfebde83da8d/tidevomopivezetabezobovug.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/80633202944.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/kidedevufiwipukesem.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/darowus.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/tavosisat.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/62203245733.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/tewuv.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/41606663767.pdfIn PDF document text
    • http://knipia.com/userfiles/file/57199109788.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/mimexidimewixobizirivax.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/48277180613.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/legupuvifamemikixadim.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202110030215499786.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/rumonuwudiferutofitoguzer.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_off0000b44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44B 15284 bytes
SHA-256: 6eb5d1a5264dfb1ab373e6903b2b535264756e20b0deb86793fc4b54f613da20
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 11048 bytes
SHA-256: 2339d96958388d05f9fe6c8246aa32c3f615f35b769a2122d23e24299f0c6d77

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