Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c04056ccb18d5bd…

MALICIOUS

PDF

75.7 KB Created: 2021-03-27 18:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 626f779be235375454a5e8d9ccd061c3 SHA-1: 5c1939859d9fd9e4f22a525db92817f8e65f3686 SHA-256: 9c04056ccb18d5bdf7ffad419052780cb3a67cd716c19977964078bbc0104cf8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/award?keyword=define+cognitive+psychology+pdf PDF link annotation
    • http://demask.fun/22864633153jzwi6.pdfIn PDF document text
    • https://pibowalemarume.weebly.com/uploads/1/3/1/1/131164440/2042246.pdfIn PDF document text
    • http://creditactive.info/copy_paper_a4_80gsm_white_500_sheetsj9ukp.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/9fie9hh/snake_colors_dream_meaning.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/kekepubarewo_wuxidil_wavubugu_vaxivadujepatuj.pdfIn PDF document text
    • https://vumiwexazowonig.weebly.com/uploads/1/3/4/6/134680765/lowaxolidiwesev.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/bs5sFjh/mountain_climb_master_racing_game.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/9776441.pdfIn PDF document text
    • https://cdn.sqhk.co/rorexamuviz/MieIgdi/lirijanisamu.pdfIn PDF document text
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/vuwifatukubu_fuwifefivilamil_ninafad.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/TTw8Hhe/69992169923.pdfIn PDF document text
    • https://cdn.sqhk.co/suxepemup/dRjbihM/carbomastic_15_technical_data_sheet.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/fasudikek/tomcat_application_server_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/chiari_1_malformation_mri_criteria.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/fresh_graduate_resume_template_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/a._m._and_p._m._full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/54310962175.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/luvanav.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/dependability_definition.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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 5272 bytes
SHA-256: c02f972e6d32a0131c8bcd72b0e5fa2bcc0f1c6ad0db21199aab91a06a6ab77c
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 11176 bytes
SHA-256: 6c317a9bde2782c297a9eb179981c2248a030eb22d3bc5e59bd27356451a7844

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