Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8afe0f617c690e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 06:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d74c2b4c3ff0652c1eb3481d351563d SHA-1: ba5d40f80e6ab5fa85ad692e8f649307e380118c SHA-256: 5c8afe0f617c690e34da71734bb6f997eb3dde36ae20b49329d101d1e526d0e1
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. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute malicious links. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an attempt to redirect users to malicious sites.

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://sushiyaslo.com/uploads/files/bufopijedesetado.pdf In PDF document text
    • http://anindecor.pl/files/file/tujedunukubekezolukere.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/lowonutexuxegosukumixoli.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/2021450294.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/11902129180.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/26996630640.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/kijaxovivavalude.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/59569969103.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/91753079874.pdfIn PDF document text
    • http://kdekdyjak.cz/data/minoxevolufiwevemegevi.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/48894900964.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/95683485200.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/vejuzik.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e175586d0b---8862739308.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/mutaluveziginefus.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/funuvudi.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/93713842465.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/88912144560.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/kuzodopuvijetagog.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/89278337975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+photo+editor+android+tabletPDF 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_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 10684 bytes
SHA-256: 7f402f2dc3965b977297c318b350305cd476dc7141e78531f8cdd9a38ef4464b
font_01_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 16628 bytes
SHA-256: 0e9162a642ed8e20f6d1bfa2c525280b421762dfc90895fd13cb6e77a1b9eda4

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