Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ceb91248edf1cf…

MALICIOUS

PDF

81.7 KB Created: 2021-03-31 17:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c92e51830e40b83b222cb35c8070bc52 SHA-1: 2df437669c4e7bcbff9842b17fd80911ab033e9b SHA-256: 24ceb91248edf1cf932a68cdb3c65432621baf18df86d9a03e98cdf5febc4a2e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://baarspo.ru/award?keyword=non+probability+sampling+in+qualitative+research+pdf PDF link annotation
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/nugigo_xetar_serofevi.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/buxovuxuda.pdfIn PDF document text
    • https://mafojavakafox.weebly.com/uploads/1/3/0/8/130814343/4963183.pdfIn PDF document text
    • https://pupalajapifev.weebly.com/uploads/1/3/1/4/131454396/jenaxufiwebir-wisuri.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/50318289678.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ff5abd9f-55d0-4b19-bc3f-3cb8ec187a12/to_all_the_boys_ive_loved_before_4.pdfIn PDF document text
    • http://tofalit.myartsonline.com/dieta_cetogenica_cardapio_semanal.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/doyles_guide_employment_law_barristers.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/angular_format_date_pipe_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6a4332-ba9f-4ee8-b138-c9f736fbe981/bible_commentary_matthew_28_18_20.pdfIn PDF document text
    • http://nitovotiroxe.epizy.com/what_is_a_good_time_for_300_meter_hurdles.pdfIn PDF document text
    • http://nakixaxev.myartsonline.com/niwujugepaxuvoribiwaro.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/c_language_compiler_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/9590665841.pdfIn PDF document text
    • http://wodedane.rf.gd/42246464986.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/setting_healthy_boundaries_in_recovery_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73653100-f51a-4cae-8199-623aad1a1008/kesutozofu.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/atom_code_formatter_shortcut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5848 bytes
SHA-256: aa19eb68dfb95364521b3e8c41a9659251a7b2ee587a4d63a147aadb654a0a30
font_01_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 11040 bytes
SHA-256: c8b4f97fa8b2e4a8f8dfeb6483e1e969ed63ed4196ca152baaf058450c079f74
font_02_sfnt_off00012aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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