Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bd2c11d03625e1…

MALICIOUS

PDF

75.8 KB Created: 2021-04-26 11:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0fc3812a0d8ca4d7530d6119729b5dd2 SHA-1: 0ddeb49d8d688aa7f4fd516c4eacd58ef74b1ba7 SHA-256: 18bd2c11d03625e1efc88d5db2d953da06718571da7bfe51fc53f65c4de100bc
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 distribution mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious document designed to redirect users to potentially harmful content.

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://seumenha.ru/strik?utm_term=black+and+decker+drill+bit+set+how+to+open PDF link annotation
    • https://noguzijevamemid.weebly.com/uploads/1/3/4/8/134890426/77ddc9019bb5357.pdfIn PDF document text
    • http://twirlini.com/wumefozodazofilalofag0lz7.pdfIn PDF document text
    • https://zivumipit.weebly.com/uploads/1/3/4/3/134317334/pesazuduman.pdfIn PDF document text
    • http://musc-media.xyz/cerfa_12506_03ry07p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5fd90abe2d0c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488806/normal_5fd1a6f032dc3.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/venejowodewapibazimazikif.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/gjgjotA/75049182389.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/8849632132.pdfIn PDF document text
    • http://trenketo.buzz/pivirerosepewuboxalwxxl1.pdfIn PDF document text
    • https://cdn.sqhk.co/kowazodonaf/ihjghjF/popuxufexirige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://popofisofol.myartsonline.com/bulletin_de_paie_explication.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/rewalefodojurofatelev.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/new_hire_first_day_agenda_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/honda_shadow_1100_idle_speed.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/molejumopeparoxebanabigew.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/traductor_ingles_espaol_gratis_descargar_para_celular.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/48631306693.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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 5504 bytes
SHA-256: 4bc44f740ac9f94ea8b3d752a6b1ebdfe1fbc9aefa34fe97f3743616d7d334f3
font_01_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 11824 bytes
SHA-256: 9960f4f9db244ef6fd372a7e644ec7ebafbb57b5399284b4a6208b21fe5433af

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