Malicious PDF — malware analysis report

Static analysis result for SHA-256 51be2577d7beb541…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 00:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 387b155667c55341cd0f377f5e556095 SHA-1: ce3ed91b1b49a71f3a219bea6505501fdfc4cf7b SHA-256: 51be2577d7beb541ebb244ff752aee5cacd89b669d0090f942fe2a7dcd28f64e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports this assessment. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://mariondhuique-mayer.com/data/file/rilovibutokirufediwutijos.pdf In PDF document text
    • http://cutyoursupport.com/userfiles/file/70189780990.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/69467042880.pdfIn PDF document text
    • http://deforma.it/userfiles/files/xusef.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109032053286382.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905133430.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/sokonozutad.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/27351480916.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/birisivedupivez.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/93056006017.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/wixunufujigor.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210906_691EB3F4290DC152.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/mubota.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/78603093971.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/xirob.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/kizonutuvojixola.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139b6a58a096---10740857880.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb4257f89e---zufemokilopamurom.pdfIn PDF document text
    • http://abwva.com/uploads/files/doxatururevoxakila.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/6980203603.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/91614754923.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/kozibubuxarogib.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/72675430428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=all+that+jazz+chordsPDF 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_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 10312 bytes
SHA-256: faaeb77df8fe724af9bc1f762276c55f04fe6346c5e236da6deb260694d5a534
font_01_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 17788 bytes
SHA-256: 772a23f6d6b60e8216555c8b579464424a4f28beda9e52e4cefaef5a9f6cb20b
font_02_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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