Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f766c7d7817f47c…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 04:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 66515a76853900e7c76598cc64fce585 SHA-1: 7e994008c72c043db36fc482bdf105500440a53a SHA-256: 9f766c7d7817f47cd5fa0d718ab6fbc4aac2a9b4dd46ac6619c30d964e0792cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, indicating the PDF is designed to lead users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ballarioarchitetti.eu/userfiles/files/44172482168.pdf In PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/14488104561.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614e577cc7344---32352812388.pdfIn PDF document text
    • https://plasy.com/uploads/file/23253353585.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/52347473445.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/18057930337.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/64801442651.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/mogawiropubon.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/mofibibudiwerogagizagira.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/zodog.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/68374460474.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5b211391ba548f12fcccdb6ba4b27d03/gojopufalegivenefina.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/95773265955.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/fezatuvebavuzugugojol.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/22252893798.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/75363267433.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/bepenitabufajitabakikam.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/xakujenavu.pdfIn PDF document text
    • https://shibbirs.com/media/files/2969579671.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/3401545519.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/nepaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+autocad+2019+crackedPDF 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_off0000b43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43B 10844 bytes
SHA-256: 3e557b74a908105970abb2fefcdcdff1e3adcd904f86a07531b5d181760115eb
font_01_sfnt_off0000cd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD95 16776 bytes
SHA-256: 14f33c6fa4012578658db0d22a6910ac2369771d17f759ded48af6c213fa66d3
font_02_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.