Malicious PDF — malware analysis report

Static analysis result for SHA-256 76887d99f20bb132…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 15:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: eb7808c2c80ed2c752d754cfe50f01d7 SHA-1: 645e2491e1c88bc71665c8d320eca415663cd21d SHA-256: 76887d99f20bb132386f53822460264ea942741e75e23aaae81de77f4b848918
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cemb.ca/upload/editor/file/pivasurugemujibud.pdf In PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/69192843410.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/xibovirej.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/90456025553.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/tatajazatesome.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/lunudeju.pdfIn PDF document text
    • https://cubic.is/userfiles/file/zimiranid.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/raravomi.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/7801914100.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/33779293112.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/86750549715.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/togemitupikaxaxoto.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/30889341047.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/davenasewugomujalibez.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/gaxan.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/10124381236.pdfIn PDF document text
    • http://yuli-china.ru/d/files/zovikigokerajonefajuboz.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/89330388260.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/garipugetesugubemebari.pdfIn PDF document text
    • http://resulgame.com/calisma2/files/uploads/xodepibu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/24095260623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sonic+rush+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 10364 bytes
SHA-256: f05c1550f44b01deeb890416fb228fd1546df270db7205cc907787c59eb3f074
font_01_sfnt_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 16668 bytes
SHA-256: ee5b275bb44798822afca2ff875b51f062cb6261897862a9ca79c9fb766e5669
font_02_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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