Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4c9e53e41e3f18…

MALICIOUS

PDF

75.1 KB Created: 2021-03-07 09:27:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 297807e78f8927dd60e475011ff6f301 SHA-1: 304a6c814dbd6784016bbaa8f45050cd0b074a2a SHA-256: df4c9e53e41e3f18391bb3c00f8a067b8abd060f7f37bb28c1a4968d6ddf9409
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a malicious domain. The ClamAV detection and ML classifier strongly indicate maliciousness. The PDF's content, though heavily obfuscated, appears to be a lure related to 'How to install rheem hot water heater', directing users to the suspicious URL. No scripts were extracted, but the presence of an external URI and the overall detection profile suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=how+to+install+rheem+hot+water+heater PDF link annotation
    • http://mobeditobaxul.scienceontheweb.net/91564270823.pdfIn PDF document text
    • http://difipalilif.scienceontheweb.net/solving_one_step_equations_with_fractions_worksheet.pdfIn PDF document text
    • https://wuluruvujomokax.weebly.com/uploads/1/3/5/3/135349857/lalodiwifudob.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/what_is_object_oriented_language_in_c.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/rekokegiluk.pdfIn PDF document text
    • http://nanewak.iblogger.org/arizona_form_a_4_calculator.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/maths_workbook_class_6.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/zerepuzuze/report_inspector_jasper.pdfIn PDF document text
    • http://zawenorite.rf.gd/d_d_4e_online_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/balasubramaniam_songs_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/49909371116.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/besuvilixebuvikox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d3018b-122d-4723-945c-c7af63eed2ae/7129595624.pdfIn PDF document text
    • http://nupakavidowux.epizy.com/copper_leaf_sheets_michaels.pdfIn PDF document text
    • http://givudejefavapa.rf.gd/analogia_y_homologia_biologia.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/68205599684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c69ecb-d86f-4500-ae99-9b6871ea95fe/does_the_ring_security_system_have_a_siren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b1de96-6f57-46d1-894a-2e7a1f2b5ed6/8545007789.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/blue_king_size_fitted_sheet.pdfIn PDF document text
    • http://wometopususap.rf.gd/logitech_z_5500_subwoofer_size.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_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 4976 bytes
SHA-256: 84d0acfef984c87668e1040f0e1db695016ca5dec5ae7c94f90c944adebcb9f8
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 10128 bytes
SHA-256: 3640abe380b0766a40fcc262cde4c4b849a25967e4fdebf32a4cf5f6499b0d25

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