Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9dfb3a964939cb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 04:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91dbef91e8ec99782ebcc037cc017923 SHA-1: 5d8d19c9edba5f271daa390876e5183b7453eab2 SHA-256: cf9dfb3a964939cbba0d3d90354d5ab363ab1cd3ba399150e5bab695f31e9a82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://doitoutdoorz.com/file/LWbbpwat3OlznBhA.pdf In PDF document text
    • http://adriennemason.com/assets/files/dumamar.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210912_9D1B0120EF0798A1.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/70211984988.pdfIn PDF document text
    • http://annabarons.com/files/files/zinavigo.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/32743909449.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/tuvigofapigiworupo.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/jaxopuzobajarade.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/ninigek.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/38698725849.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210906_083042.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/46656624096.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431de001844---30957791298.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/xezaladigunonifula.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/63721205261.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/gawuwebovupaforeregulu.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/sagimemagigotegek.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/dalufezurisor.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/xaguson.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/bababudeweworemunuxexusur.pdfIn PDF document text
    • http://harlit.com/upfiles/file/53452431413In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=english+grammar+by+indian+writer+pdfPDF 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_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 11148 bytes
SHA-256: 86c0dd873232f0fb12abfbfe325761a78c296c489d380b00ba762de41594e710
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 18068 bytes
SHA-256: 77f99be4948aa6fbe3b5a6bb82bb9bc4d859ee841ee4cbd44e25f43177ec9aa1
font_02_sfnt_off00011d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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