Malicious PDF — malware analysis report

Static analysis result for SHA-256 235d70b0732dd053…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 15:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8397994e39fd6a2f5237078e87a901f SHA-1: 45daa5b35201084380b27f3c92213a492ced95bb SHA-256: 235d70b0732dd05310c2b0f92fa60fcb667550ebf1d2e8b8c2dbbeb5ce0bfa38
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/award?keyword=how+much+do+martial+arts+classes+cost+uk
    • http://nofovukad.iblogger.org/koraput_odisha_song.pdf
    • https://cdn.sqhk.co/sezogitov/ib7gdoy/jumamala.pdf
    • https://cdn.sqhk.co/sadetujadufi/jhblzhe/22926107759.pdf
    • https://cdn.sqhk.co/tuledapozato/iijeDjj/bass_booster_software_for_windows_7.pdf
    • http://nibelv.xyz/robikapolivaledifevuwifak6t.pdf
    • https://cdn.sqhk.co/nudavede/vYjga2Y/febunakono.pdf
    • https://cdn.sqhk.co/wabedamor/aUhb2m4/dragonpass_vs_priority_pass.pdf
    • https://pibubeje.weebly.com/uploads/1/3/4/3/134374065/wobezirogek_bezazizawun_zoxilut_lijasud.pdf
    • http://copyrightshelpcenter.com/bopideruxe91e6n.pdf
    • http://formblckr1.xyz/recuperar_backup_whatsapp_do_android_para_iphonevaf30.pdf
    • http://pitushok.fun/parenting_capacity_assessment_report_samplez3x11.pdf
    • https://winetokazujubap.weebly.com/uploads/1/3/4/3/134321452/292cd2c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/guxosa/barbados_passport_forms_renewal.pdf
    • http://timodetunidup.epizy.com/free_indesign_cv_templates.pdf
    • http://vudafudilisa.epizy.com/33622779446.pdf
    • https://s3.amazonaws.com/rujimidujek/enhanced_recovery_programme_colorectal_surgery_guidelines.pdf
    • https://s3.amazonaws.com/tesapibebujep/ps4_controller_emulator_for_pc.pdf
    • http://rixuzomobe.epizy.com/logitech_anywhere_2_wireless_mouse_setup_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f358.bin
a6df816a5f4c9858528c0e012cf39b811ca65c11095e5fd160c646f726231502
pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 5296 bytes
font_01_sfnt_off0001053a.bin
ef87c31e56194f5b3a12ef46794794076c69f18ebf95639c846d4a62dfc5e1a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 10736 bytes