Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbaefeba7f5b591…

MALICIOUS

PDF

77.6 KB Created: 2021-05-31 06:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 040242b3260e3591d2b23b9569beb113 SHA-1: 2ebfb772a7c08e6e6de94fb9ec1c145828988a4b SHA-256: 1fbaefeba7f5b59134663668f0c5af74f8749660bb55920980c4d19e199e533a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF documents hosted on external sites. One of these links, 'https://xezojetit.ru/strik?utm_term=creative+powerpoint+templates+free+download+google+slides', is presented as a lure for 'creative powerpoint templates'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://xezojetit.ru/strik?utm_term=creative+powerpoint+templates+free+download+google+slides PDF link annotation
    • https://nitenativab.weebly.com/uploads/1/3/4/6/134698737/f5ad5c3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_5ff82f8250bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014c921b55fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_603fadb12045e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473971/normal_5fce5072e4ba6.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/b91f1280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491412/normal_6065639487a15.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/gusojaz-kovusawebuduza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465694/normal_6001c3496bf5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dffdc84-cf7d-4f1f-b227-7fd14c546869/favavakuluvifesuzasogajad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01747fa2-7015-4fcf-bbe1-4f71326d3cf7/tipos_de_medios_de_comunicacion_masivos_y_sus_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4553cde-5d5a-48ea-a95d-ab658cd1d015/how_to_use_multivariate_regression_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f8e87e-06e6-4064-bd06-bf1a82f49fd0/36424033110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a5e6cc-c617-41f9-ae3c-2acb3ed3dd52/husqvarna_leaf_blower_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeedf0d0-966e-4e23-aae5-21419874fb78/14394991536.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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 5420 bytes
SHA-256: beb2cf6f73bd91f817fc52452ef64fe6bd74680953adf8519b5483c02f670192
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 11760 bytes
SHA-256: f7f19e2a9b1ccb70516546dc8607b5662ba5616d8f2e93dea7bd97ce50d49ec1

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