Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad923c82fc02e81…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 04:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: eb2fe612ba6df095ff4a8228a9f4b720 SHA-1: 7b742ebe8af0668545dd24e7b4b6bdacdcb5e8a7 SHA-256: fad923c82fc02e81d74522eeaad82c27ab7fde516c268a3c1e9638d5d84fd959
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://efficimm.fr/userfiles/files/47988570538.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281b9893af---62611510123.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/28029381285.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/45945571660.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_093620.pdfIn PDF document text
    • https://vleek.com/uploads/files/mepuzipijunarepaletegazu.pdfIn PDF document text
    • https://vleek.com/uploads/files/28358627703.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/83805212983.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/turibawisefata.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/dexomenomivevopiba.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/jorakatebul.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/vozosiredemokugupasuxode.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/xetil.pdfIn PDF document text
    • http://4darchitecture.org/img/all/65192841472.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/12530596999.pdfIn PDF document text
    • https://solturism.ro/images/file/samazogarid.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/lewizonetixuf.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/vusopojinida.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qg2lu9a019jh32dm0fhlmbp2qn/45144390217.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/64604096545.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/87919931352.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/4907720413.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/21430648146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=stickman+fight+mod+apkPDF 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_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 10788 bytes
SHA-256: 9b7fb7b54b8e652c1990cc08ab646c0fa9e85aee573ce2c78d363956a5c7a06c
font_02_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 18140 bytes
SHA-256: b62698914eb0bc9a0c56b8923c1295311ad9ab70b5a5214c283b3288cac94ed9

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