Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f3ff398c37a7fa…

MALICIOUS

PDF

83.5 KB Created: 2021-02-26 12:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c4db6996e60255b30fe32847ecd6134f SHA-1: 5c78e568c9c90663a337f5b13ab38d928e24ebad SHA-256: 91f3ff398c37a7faa40b0eac80e2a6cc1d883f18a2379731e18f38eee9aa8759
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=what+color+wires+go+where+on+nest+thermostat PDF link annotation
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/57295.pdfIn PDF document text
    • https://cdn.sqhk.co/fetogivaw/jgj1Wge/2134771289.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/ib7hflK/pexonofonumapaxozudaxigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_602a28589b906.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/pjhw3Tp/vixiramo.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/vhcBify/90363205800.pdfIn PDF document text
    • https://cdn.sqhk.co/fasazani/b07ihzX/kexewos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fetufebutegiv.rf.gd/90643418491.pdfIn PDF document text
    • http://pepebejawu.epizy.com/bahubali_2_film_mp4.pdfIn PDF document text
    • http://galizojiga.rf.gd/bopasavemukefexaxusux.pdfIn PDF document text
    • http://zevusup.atwebpages.com/how_many_carbs_are_in_a_slice_of_margherita_pizza.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 5316 bytes
SHA-256: 2468f1142c66584c6fa6f680af4ec80fa080ab41c1c4001299e88f5f74145856
font_01_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 10168 bytes
SHA-256: 0d8bec09362c94885906e949b9ce1ce3840ba207baaf112a7cff8ba7012ff7f9