Malicious PDF — malware analysis report

Static analysis result for SHA-256 c240eb2b41d30d0d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-30 13:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 19c1f3382fc98b1e0cc0c074068893d7 SHA-1: 3279e6e5c14ed9db9b328c57f5255e2ae7d1a622 SHA-256: c240eb2b41d30d0d5f512033a4f4ea149d80ad0d8730434da7df766db266d2e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using many distinct, disposable hosts to obscure the true destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the structure and heuristics suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/15548772793.pdf In PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/bosimu.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/36940482920.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/rexosawos.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/sipapikibijopabilabi.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/85320082952.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/31945882683.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/nodomejamevinovod.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/58693684753.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/59549127af1eef370826e3352e40fed5/kulununekiwapejumuvupowu.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/86174762207.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gijaraxebinel.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/xaloxodizepiredasin.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/tugapibowina.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/bumep.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/nobajaliroxujepegosukub.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/gonog.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/genutafuw.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161532d8522918---2331032676.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/vozomedopivirurafujawivo.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/45324071618.pdfIn PDF document text
    • http://altus.pl/userfiles/file/27224636097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ch340+android+driverPDF 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_off0000b740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 10500 bytes
SHA-256: 6692555568dd6bcdeeb1f18d0de396e563334e5a9cd1e9591f9ac71f81fa38e3
font_02_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 19540 bytes
SHA-256: 985a79f835917b777f38d07ab6f2b358b4870ad6ec143a15b5e1a177d6a62965