Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2453c894b397f87…

MALICIOUS

PDF

84.2 KB Created: 2021-03-11 19:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18d14f19aa3947456dab8e6283f73690 SHA-1: 1597e38571b6ff7c98e461bdadd417204b919f73 SHA-256: b2453c894b397f87b0e59e0c1acb3d1ea6adb714eb83b70844f2d0cfc0d9f5b6
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified as malicious by ClamAV and a machine learning classifier. The document body, though heavily obfuscated, suggests a lure related to 'phospholipid bilayer function pdf', likely intended to trick the user into visiting the malicious URL. No scripts were extracted, but the presence of external URIs and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/123?utm_term=phospholipid+bilayer+function+pdf
    • http://lienforkid.com/direct_download_anime_megalnbut.pdf
    • http://phtech.site/879165284618r0mu.pdf
    • http://idealslimitalia-ufficiale.site/reporte_de_lectura_de_auxilio_no_sop7348o.pdf
    • http://istlan.space/werunufisisiluqj18.pdf
    • http://zaximudetebase.iblogger.org/14911833050.pdf
    • http://reduslim-officialsite.site/garmin_gpsmap_76csx_maps_downloadi20my.pdf
    • http://ooovseanalizi.ru/625840612823kx6a.pdf
    • http://twitter-center.com/atelektasis_adalahqjdf2.pdf
    • http://podarokinsta.site/celebrate_recovery_lesson_11_answers7i986.pdf
    • http://prodson.fun/narrative_report_for_ojt_samplej1fo6.pdf
    • http://gawajix.iblogger.org/ronevunakatajug.pdf
    • http://myfirstsite.xyz/50_shades_freed_movie_youtube6s155.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nekaxogide.epizy.com/14030856183.pdf
    • http://femodizabofowu.epizy.com/momifuwetutexifoj.pdf
    • http://dixolasafu.epizy.com/chord_progression_midi_files_s.pdf
    • http://letinolav.epizy.com/clinical_examination_essentials_4th_edition.pdf
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_fa1a8376842e409998abb4a51e730cd0.pdf?index=true
    • http://limizepafut.epizy.com/first_vs_second_conditional_worksheets.pdf
    • http://furofazitogo.epizy.com/mejasajunupubolofebus.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_e0b82d3122244681a923c11a265a0dcb.pdf?index=true
    • http://tunawumananedi.rf.gd/55153255410.pdf
    • http://kupaxomuwekag.epizy.com/ppsspp_emulator_for_pc_windows_8._1.pdf
    • http://majoxokusixapav.epizy.com/belmont_care_home_cqc_report.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_off00010b42.bin
fc0e5047a0a5b9e562606ddf6b852984fca8fa13ad49e566f601878f4df79fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 5484 bytes
font_01_sfnt_off00011de2.bin
aafeca0cf11ab552cc325ee96d7f955f6b5d92c10e06fa478be588f055f1134b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 11068 bytes

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