Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b2908f8c926389…

MALICIOUS

PDF

89.1 KB Created: 2021-09-09 06:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cab80c76d0f7bd6591ddd8b9f7e16d2b SHA-1: 893ad93007df8f892e0c06997ca95e0c50bbc198 SHA-256: 70b2908f8c926389f9147c7f475dfc71278b840cf675816fa743f5694c7b4ffd
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are part of a link farm designed to direct users to external sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to trick users into visiting potentially harmful websites or engaging in scams. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://szintai.hu/ckfinder/userfiles/files/89205908670.pdf In PDF document text
    • https://businesslife.com/content/file/72304122244.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/64742147914.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/vebub.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/67199941352.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/58855966972.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/zepomulupasunaxi.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906150909.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161388677addf0---munalupejiludovo.pdfIn PDF document text
    • http://adriennemason.com/assets/files/rosisebademibekog.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/60511431157.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfe05b646---87619891049.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/52911890832.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/fufokuwovejuvefadomutol.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/61323461793.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/nuwafidupijegolufudimaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+movie+software+for+windows+10PDF 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_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10772 bytes
SHA-256: 2e64e7224fa6d40098faf816ace90d8c1e6b9f63b005b4dc162d74f26b079e9d
font_01_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 17992 bytes
SHA-256: f885dce1d604b1a19e6fdf1f11ac4d209e2e58cf747f1798aa1c512e02f0d053

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