Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24aaf506d98c807…

MALICIOUS

PDF

66.7 KB Created: 2021-02-15 06:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 97c3a58fcd3b095420e4729579df902c SHA-1: 73c8a9e15b22ff9815f9076ef9736c9ce616f9c7 SHA-256: c24aaf506d98c807d5a1b0bc1341c2859c4c5d9bdcdb6522bf7d7bf6ef36ab6f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=roblox+adonis+kidnap+command PDF link annotation
    • https://dogusomuribe.weebly.com/uploads/1/3/0/8/130814063/sajanazuxi.pdfIn PDF document text
    • https://pazopoxe.weebly.com/uploads/1/3/5/2/135293382/5458586.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/TheROQd/fesolavizila.pdfIn PDF document text
    • https://xikisujegowo.weebly.com/uploads/1/3/1/8/131856166/2275575.pdfIn PDF document text
    • https://kobuzefejara.weebly.com/uploads/1/3/1/4/131437799/pidiwazekopoz_jululefanepe_wamixujukubujet.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/SAJajg8/nujasuwunuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dujepav/anatomy_for_artists_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/fragile_states_index_2018_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/winston_churchill_school_ofsted_report_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/ct_bt_trang_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/safasafenagobimitonira.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/access_control_policy_iso_27001_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/lukopoforadome.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/mabilojuri.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/om_meditation_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/aprendizagem_baseada_em_projetos_bender.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_off0000c70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70A 5404 bytes
SHA-256: 0e3e7795bb0f75b0bb8db7f172908e950f959a41458afd806a41b36dc287b87e
font_01_sfnt_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 10936 bytes
SHA-256: 922ce4bf59404f0edaf5ecfd0541984eea28327c4d8a581392c758df23f08012

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