Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bc392a4b0d2c4a…

MALICIOUS

PDF

96.1 KB Created: 2021-06-02 10:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 817446d724f286a12d11188e85b46742 SHA-1: d80f38aeb09ba2be52abbca6090d74ac2f49a867 SHA-256: c7bc392a4b0d2c4af2d50b2a87dde9eb5be7d8a2b299ef0c35e5947adc883ce8
96 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious URL, 'https://crewmak.ru/pbw?utm_term=integral+maths+section+test+answers', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/pbw?utm_term=integral+maths+section+test+answers
    • https://vobogokofudukig.weebly.com/uploads/1/3/0/7/130775751/be6e36.pdf
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/bivoran.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sutodoromar.pbworks.com/w/file/fetch/144489489/pattern_worksheets_for_grade_1.pdf
    • http://zufogopojut.pbworks.com/f/tiposujirijowutupu.pdf
    • http://sodopateduke.pbworks.com/w/file/fetch/144424791/ill_be_on_my_way_sheet_music.pdf
    • http://tagexoba.pbworks.com/w/file/fetch/144423246/how_to_use_excel_for_daily_expenses.pdf
    • http://genarozep.pbworks.com/f/wagedobaleruv.pdf
    • http://jolowajuwijo.pbworks.com/f/xumakid.pdf
    • http://pefagisunel.pbworks.com/f/jikisotumeja.pdf
    • http://wuxikadafi.pbworks.com/f/xuwigasefuxeduzuzaxar.pdf
    • http://rimogeto.pbworks.com/w/file/fetch/144427425/sql_server_2008_r2_download_for_mac.pdf
    • http://zikupuzajix.pbworks.com/w/file/fetch/144444735/pitch_perfect_2_movie_download_in_hindi_480p.pdf
    • http://nikekuva.pbworks.com/f/how_to_setup_a_sharp_alarm_clock.pdf
    • http://pitevaj.pbworks.com/f/asp_safety_fundamentals_exam_secrets_study_guide.pdf
    • http://natizasex.pbworks.com/f/nusojigef.pdf
    • http://zigunef.pbworks.com/f/57350347393.pdf
    • http://mogulazedub.pbworks.com/f/65202516494.pdf
    • http://paderukut.pbworks.com/w/file/fetch/144452124/zadeku.pdf
    • http://sizolasipape.pbworks.com/f/bleach_brave_souls_lvl_200_guide.pdf
    • http://ronefete.pbworks.com/w/file/fetch/144492390/pugidutikiro.pdf
    • http://liwuvedesisu.pbworks.com/f/fuzujolukizo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013672.bin
efdeb9c8577bd6e7c09a52b31bd5201781cd802ad04574b3139a56018beaacbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13672 5240 bytes
font_01_sfnt_off0001482d.bin
edcfb549222ee2cd27d3d9a661507cd3e681dcbab210d2158fcb50efd9b48544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1482D 12564 bytes

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