Malicious PDF — malware analysis report

Static analysis result for SHA-256 0365afc790556d15…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 19:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75ec959dd8742ba7893399aa0ab19d52 SHA-1: af618191d11b23ffa2eff27296c1145ec8b3a7fc SHA-256: 0365afc790556d15cc170ee5cd85dc97d5f2f23da3301106d31d3e2002cd157a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to external sites, and one heuristic specifically identifies it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

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://gotoippc.com/ckfinder/userfiles/files/87285321332.pdf In PDF document text
    • http://sunway.me/uploads/file/080914147483.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/55411718054.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/29448350800.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/maketarajugomeke.pdfIn PDF document text
    • http://grupophi.es/uploads/files/44721750860.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/1649070314.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/mipedofugamexopitusesoki.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/josenazegej.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/novuxudupitobile.pdfIn PDF document text
    • http://secretinvitation.net/images/files/vivejexuvegojaxozoz.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/58400226447.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/37543793844.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/66734741215.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/fovudu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136498030514---74901526504.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613297e2bffaf---85863379685.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/luziten.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/43421588767.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/96015920256.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pexofupivejanolat.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/99400812331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=theological+wordbook+of+the+old+testament+pdf+downloadPDF 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_off0000bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 11348 bytes
SHA-256: 604732402f6a5e0c88cf46169f1a0d6dc045c0978101978390bfa26f52bfd937
font_02_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 16856 bytes
SHA-256: eb2f138537c7626c536046dc6a5f4974033cc6ed8f72264bf6c93c7bfe050223