Malicious PDF — malware analysis report

Static analysis result for SHA-256 10caaefb92db83cc…

MALICIOUS

PDF

89.2 KB Created: 2021-10-08 09:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4de951dca5cfb6d0278f0f8a73e46950 SHA-1: bfa4749b07fd14294af82c30a1e388b60265abf1 SHA-256: 10caaefb92db83cce522260e49acb168bc5971063dc5fb0a1b9cd1d61614265f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=the+witch+movie+ending PDF link annotation
    • https://pensionradvanice.cz/res/file/40345193375.pdfIn PDF document text
    • http://wjcopy.com/upload/files/74834237392.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/55612249904.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/worabifudetefejonepe.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/dusoben.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/92783378253.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/leroxujumomokalija.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/jaxovigikaretiluge.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/67288572550.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/172236022.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/pexegijepamegexepa.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/jenebuzujodonexu.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/86099530125.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/jefusimudig.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/fuxoguxefedosogifix.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152c0b615f18---wezogexetefopuj.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/13888109143.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/77297603434.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/morukulajivatala.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/24200426448.pdfIn PDF document text
    • http://dytac.hk/userfiles/79307844328.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/gowakorufalomakegejixitaz.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/46614427767.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_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 17304 bytes
SHA-256: 998ced883f29d1e835d1237a44b449213d579d069375e620cf86c2efaae15e4c
font_02_sfnt_off0001400e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400E 10456 bytes
SHA-256: 3e466394442e3a7068509c7a6bf297ad51a434c9fd02bc4cde7c111c91817101

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