Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a384488c4e34ec5…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 08:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7c7de4fd067f1da5cf5cd4db476c1404 SHA-1: 7679e6d536ab281bc5a29f1095940e33e8aee3d7 SHA-256: 9a384488c4e34ec57febfa1b0acb6d5fff9b2e2e7993bb53b49d181befb659ad
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to an 'Eskom bursary application form'. Several embedded URLs point to disposable hosting and link farms, indicating a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded links are indicative of a social engineering attack.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=eskom+bursary+application+form+2020+pdf PDF link annotation
    • http://fsbsiod.com/bushnell_pacifica_20x50_binoculars_review9107x.pdfIn PDF document text
    • http://shoop-fp.ru/building_code_evaluation_reportea6hh.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/medical_terminology_for_health_professions_ann_ehrlich.pdfIn PDF document text
    • http://shopwithsale.website/grade_9_math_worksheets_geometry9d2ed.pdfIn PDF document text
    • http://ig-socialmedia.xyz/the_adventure_zone_graphic_novel35dx0.pdfIn PDF document text
    • http://gamedv.design/civil_engineering_reference_manual_17th_editionixgsb.pdfIn PDF document text
    • http://ooovseanalizi.ru/solving_literal_equations_for_a_given_variableu3gw0.pdfIn PDF document text
    • http://xubajur.mygamesonline.org/black_swan_books_oakland.pdfIn PDF document text
    • http://ketadiets.site/what_size_backpack_carry_onuk9qq.pdfIn PDF document text
    • http://everydays.space/what_are_the_rainforest_plants95nf7.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/cf394545-26c6-49f0-bf93-8154e522a3c9/zimawejatofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119edddf-b9bd-4de4-a32f-bdf790a2e70e/adding_and_subtracting_rational_numbers_worksheet_6th_grade.pdfIn PDF document text
    • http://nudibiwer.epizy.com/logical_fallacies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8bf553-ebab-4e4d-9f14-7155de4ac35e/62759662996.pdfIn PDF document text
    • http://tizelimanux.rf.gd/what_type_of_bobbin_does_a_singer_4423_use.pdfIn PDF document text
    • http://likifodafiduno.epizy.com/pcd_calculation_formula.pdfIn PDF document text
    • http://sawopirorafo.rf.gd/the_electromagnetic_spectrum_worksheet_answers_24._1.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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 5604 bytes
SHA-256: f29b07dcf808ec0ad8d8978f0ea72d711859179a1dde1709c07f3fb785ea28c2
font_01_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 10864 bytes
SHA-256: f1ec36a96cdebee826193ffc4ae4038574061d4aaa4ed783395f5dc5092cb5d1
font_02_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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