Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0273158538242f…

MALICIOUS

PDF

73.1 KB Created: 2021-04-19 21:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2ae0596e4b85ec469e814def6487cb81 SHA-1: 5c741841406985a1656d53902cfff18bde03fef4 SHA-256: be0273158538242f0c3e943306e579f8c10fa5c53710074a7fc19833f40cc5d2
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, indicating a high probability of malicious intent. The PDF contains numerous external links, with one specifically pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and extensive link farm heuristic indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=dark+souls+2+ps3+hackers PDF link annotation
    • http://vawifasu.22web.org/frigidaire_50_pint_dehumidifier_room_size.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuxedodi/ig001jh/lefudunesa.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/hiaFeFe/46268306357.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/LKhgjeZ/dangerous_drugs_board_report_all_about.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/ahbDJjc/fezavenenelakesi.pdfIn PDF document text
    • http://maroron.22web.org/overtime_payment_request_format.pdfIn PDF document text
    • http://lakituman.iblogger.org/63020750566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerufemebokuv.rf.gd/pathfinder_chosen_one_guide.pdfIn PDF document text
    • http://fopajika.epizy.com/balada_insan_muda.pdfIn PDF document text
    • http://bogigipoja.epizy.com/zisomoporuzoxonowiw.pdfIn PDF document text
    • http://jazifuz.epizy.com/24257013655.pdfIn PDF document text
    • http://bowukedogatowo.epizy.com/45548941069.pdfIn PDF document text
    • http://memavopunon.rf.gd/tokyo_guidelines_cholangitis_diagnosis.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/is_fpgee_difficult.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/reading_comprehension_workbooks_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/bearings_types_and_their_application.pdfIn PDF document text
    • http://xibubew.epizy.com/biochemical_analysis_report.pdfIn PDF document text
    • http://sipomivizipe.epizy.com/python_convert_dictionary_keys_to_string.pdfIn PDF document text
    • http://dolowebufawazir.epizy.com/1155308725.pdfIn PDF document text
    • http://dinazodes.rf.gd/89945575886.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_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 5380 bytes
SHA-256: d29ffc41d4fe82bbf21b9d943f7e611e52a6f45f1a280015a71723e6edf26f2c
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 11044 bytes
SHA-256: 8147dcf30249b4c857b02769a9f4f533f56f45d82053092fb468f548aec504ec

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