Malicious PDF — malware analysis report

Static analysis result for SHA-256 4becb2ebc04adb38…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 12:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a11e5538ece05883ba8877bf5badca76 SHA-1: b61d85754becdb53c844799a013a2742eb208642 SHA-256: 4becb2ebc04adb380e6818e4b6506e13465ca7fa0e4047f9830a0161af36f7f8
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 0.9996

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://lozipotod.ru/123?utm_term=bantu+education+act+pictures PDF link annotation
    • https://ruxapumuful.weebly.com/uploads/1/3/4/6/134682584/381c7.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/77793930058.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/dremel_flex_shaft_collet.pdfIn PDF document text
    • https://wadenipix.weebly.com/uploads/1/3/1/4/131408068/muvuz_vosofiviluwe_xefefikibove.pdfIn PDF document text
    • http://coupons2020.info/what_is_the_difference_between_eastern_and_western_philosophy_about_human_flourishing1qr4r.pdfIn PDF document text
    • https://mujesazuf.weebly.com/uploads/1/3/2/3/132302915/fapumip-guwibijoron-gunov.pdfIn PDF document text
    • http://it50discount.pro/73917444440f198w.pdfIn PDF document text
    • https://nuwusiran.weebly.com/uploads/1/3/5/3/135321198/8199899.pdfIn PDF document text
    • https://jofesubuz.weebly.com/uploads/1/3/4/7/134775001/9c734183.pdfIn PDF document text
    • http://siankaanmexico.com/irctc_rail_connect_app_download_for_iphone9jcg9.pdfIn PDF document text
    • http://antonioit.fun/university_of_phoenix_associates_degree_information_technology1v3pu.pdfIn PDF document text
    • https://kazimiposaduvab.weebly.com/uploads/1/3/1/1/131163956/zulisomilojibe-domalafurataf-zudesixa.pdfIn PDF document text
    • https://napuguzexavuzes.weebly.com/uploads/1/3/4/8/134875267/6486ae2a7a.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/fizup/technical_graphics_communication_4th_edition.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_e0432f4f218e4ee6babb7128815ff1f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/black_panther_coloring_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/what_is_the_coldest_setting_on_a_haier_mini_fridge.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/20802277450.pdfIn PDF document text
    • https://f5ab370f-1445-465c-ae0a-adb246d340ff.filesusr.com/ugd/2d95ce_79bf3592e0184b1787c3cfdd92231a2f.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_29ff45bd1ad845308de757ea10848517.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/dudum.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_435eec7b3a0c4f3bb928c2d0f7382de6.pdf?index=trueIn 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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 5084 bytes
SHA-256: 479bf98b840b4ef91a55cb40451db6b09ef93af9d3d1251dbf702db081fdfe1e
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 11600 bytes
SHA-256: fd4052c4e502de6bc9cfcae796d57354af3d630dbbc97a0ff4397caad12f9c07

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