Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c7f40bebccb16e…

MALICIOUS

PDF

74.8 KB Created: 2021-03-14 08:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 305ddedd02b58e35acb506a8c0f1e313 SHA-1: 26316f55d3f132f935161b02bd5cc599a35ada6e SHA-256: 31c7f40bebccb16e7c96f1d6d05724cc75d066db1fa2f4d69d4af5e1f70f5fa5
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 suspicious domain. ClamAV and ML classifiers have identified this file as malicious, specifically a phishing trojan. The presence of an external URI and the ML detection strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://vilenefex.ru/strik?utm_term=hatha+yoga+for+beginners+pdf
    • https://cdn.sqhk.co/xotosira/Gb9zSjg/hitman_go_android_review.pdf
    • http://xomutukegadoj.mypressonline.com/biology_notes_for_class_11_sindh_board.pdf
    • https://cdn.sqhk.co/xafogatok/idxhiji/32344709321.pdf
    • https://cdn-cms.f-static.net/uploads/4365555/normal_603e214d2b445.pdf
    • https://cdn-cms.f-static.net/uploads/4461485/normal_600b76a35b078.pdf
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fe6b90412569.pdf
    • https://cdn.sqhk.co/juvokapo/aK9Ommz/analisis_foda_ejemplos_en_gastronomia.pdf
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5fd099fa48b27.pdf
    • http://ita-bio.fun/classement_coupe_du_monde_rugby_2019qzg8m.pdf
    • http://jibiduseg.22web.org/video_player_android_terbaik_ringan.pdf
    • https://cdn-cms.f-static.net/uploads/4375203/normal_603f426cb867b.pdf
    • https://cdn-cms.f-static.net/uploads/4379380/normal_6030345b130a1.pdf
    • http://lagukuburen.iblogger.org/maytag_quiet_series_200_dishwasher_control_panel.pdf
    • http://digovin.getenjoyment.net/gatavadizuzukumotufikisa.pdf
    • http://jovefupe.mywebcommunity.org/57141097048.pdf
    • http://nubolutlion.xyz/manual_adobe_acrobat_pro_dc_espaoljyor9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nawugem.epizy.com/austin_allergy_mold_report.pdf
    • http://buzumigasox.myartsonline.com/wave_motion_in_elastic_solids.pdf
    • http://zorufuzelal.rf.gd/debating_first_speaker_affirmative_template.pdf
    • http://kifowusaw.epizy.com/audit_report_format_for_fy_2016-_17.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_off0000e8c4.bin
a1f150b0f608a82d6654f6c39ed10b08bde1fe2933d1da06dc1e756ca835db99
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 5476 bytes
font_01_sfnt_off0000fb5f.bin
f2fda138c8da9d2a3f2894e2c9713d61d23128a4ecf8e333cc9f6286d4dc3b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 10088 bytes