Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd774c90a608ee39…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 01:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b8967f7e448f450adfc8b279837ff31 SHA-1: 992fd0e122847357b34b113670e801388c1bbcd7 SHA-256: dd774c90a608ee390cf00658f841067f03ccd8f7e2fb8cececbf6e47468fa435
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The PDF contains embedded JavaScript, which is commonly used to redirect users to malicious websites. Several external URIs were extracted, many of which point to PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vsetinrally.cz/userfiles/file/xanekevomemib.pdf In PDF document text
    • http://fratellibeninca.com/images/file/93226181667.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/dozivi.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/jodidewupir.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/15120275162.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/21454793797.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jrhq7gcgc18h2qs6t5hjmbr3h0/lovegarurulag.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/32519894329.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/59627091210.pdfIn PDF document text
    • https://limsurdua.com/contents/files/23906735090.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/20356682195.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/6625175139.pdfIn PDF document text
    • http://planetamama.ru/files/file/90267847137.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/94818913301.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/mowakul.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/kozoxorosuro.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16131851894d3f---faramobadegasajuziz.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/tozebonigogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cheat+code+keyboard+for+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB5 18192 bytes
SHA-256: 4dd46e9ab9a9ca71c3e09e01a8f52258f384533628f2e7ac8ba64552e92fbfed
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 10736 bytes
SHA-256: 886985dc8a55c0d20f1c90fa95bb94a849044be817f234c2d3fbfd6e65abc7f8
font_02_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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