Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9f8f2de4a7dc58…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 02:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1be88357e403c610fe0c2b419c2d0aae SHA-1: 4d287ad3a1010b6c4d216196126eca47f3a78914 SHA-256: ca9f8f2de4a7dc585d12f43d603ba5c745353520d0e445dba9a9ab4739d32d91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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 https://onutglen.com/caningest/images/file/8344126848.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/39361205192.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210906180315149.pdfIn PDF document text
    • https://andrejc.si/files/file/78654983425.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/dutatemoxumod.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/polexovekosezobi.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/jatokubusile.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/fawelojipaxi.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/64503858752.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/37197264954.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/30601883135.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1eae768dd---44185995654.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/96355688711.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5359fd07---12107376277.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/vimopujevorif.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/89556909642.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/fofupevowaja.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/82923010874.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/nodujobuzokezimufozug.pdfIn PDF document text
    • http://speckrepej.com/upload/file/94893397333.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/47067005432.pdfIn PDF document text
    • http://letdentalab.com/img/files/nanuwuturemigovejebelukep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=test+de+habilidades+matematicas+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_off0000c261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC261 18572 bytes
SHA-256: 5206f5c641022290622f27ad6d88d4bfc2e48eaff65d172edd0dde693a3b5f90
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 10664 bytes
SHA-256: c765563c24ea04b8279d33678fc37c53ba89dc8c3bf3fdbdaf87ea80e2fa7db2
font_02_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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