Malicious PDF — malware analysis report

Static analysis result for SHA-256 99691d379e4213cc…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 06:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3128242cf4ec9240a649a3b2713bce2e SHA-1: 4f508b1468609c7bb90d4d877be7fe81efef0bdb SHA-256: 99691d379e4213cce0610a53ebe0eaf099c99d705829d9ec30e7a1e7194e6f6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://csc-0898.com/userfiles/file/20211001092614_r29bs9.pdf In PDF document text
    • https://remini.hu/userfiles/file/lojabekaxirewo.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/kepip.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/jutida.pdfIn PDF document text
    • https://angem.fr/userfiles/file/rovabej.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/45967910357.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/sonesisefejerukugurufo.pdfIn PDF document text
    • https://durimawar.com/contents/files/12837094210.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/61803006146.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/91901260314.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/patutoteb.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/suwifedamesilafobozugoze.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/pajolamizogujugelowuvez.pdfIn PDF document text
    • https://taperagi.com/contents/files/33141801585.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/jegesujuxokezimogov.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/335fd3qt0j6rf9u3kdi6e5ml34/38548486006.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/vowamukaz.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/6555722282.pdfIn PDF document text
    • http://tabletopad.com/images/file/75985279237.pdfIn PDF document text
    • http://one9five.com/userfiles/files/fumejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=devil+eyes+roblox+idPDF 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_off0000ad09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD09 16172 bytes
SHA-256: 28db79741459f3ec98a4cfa1f1cba33554730e8e7a5d221a9813dcb0d0a6935f
font_01_sfnt_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 10300 bytes
SHA-256: f22a82876d3af6a090cb910e0ef05345d0f42f4a5805e5e83bfe128b57fa3031

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