Malicious PDF — malware analysis report

Static analysis result for SHA-256 5408d109e09d4cf6…

MALICIOUS

PDF

74.7 KB Created: 2021-03-04 05:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9a02a1c2e8335800048fbd511c36601e SHA-1: 0342bda97973b30d05bf6c9f259514963371317c SHA-256: 5408d109e09d4cf60b7a11a27dcc5ce645252789e516207fdfef4c463c1a5309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many pointing to seemingly unrelated PDF documents, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or hosting malware. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of 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-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://botokaw.ru/123?utm_term=percy+jackson+lightning+thief+book+chapters PDF link annotation
    • https://vuxabodunufa.weebly.com/uploads/1/3/1/4/131407539/2dea7e16a84.pdfIn PDF document text
    • http://luminar4-download.xyz/arkansas_drivers_license_document_requirements9cc0x.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/what_is_primary_and_secondary_standard_give_example.pdfIn PDF document text
    • http://wosozage.mypressonline.com/jeep_grand_cherokee_wk2_workshop_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_602af3a037017.pdfIn PDF document text
    • http://magnetfix.store/tugobaritir2y5y.pdfIn PDF document text
    • https://rofokaragi.weebly.com/uploads/1/3/2/8/132815015/jaxukejokore.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/wexukufedepim/30706132670.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/changelog_template_gitlab.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/carol_of_the_bells_guitar_ensemble.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/95751678693.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/semapisok.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/path_of_exile_blight_oil_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/vaputopopi.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/cantilever_retaining_wall_design.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_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 5660 bytes
SHA-256: 5ced2720617660e86446997d91080027b9de1a43ff4c7c537bad0c0d5ba1de6f
font_01_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 10180 bytes
SHA-256: a054c7f5c5ea7930b12cc6311fe5aaf708ce1f1a3b9ea63c784ca16a2c82077d

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