Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fc714199c0a0f6…

MALICIOUS

PDF

74.1 KB Created: 2021-03-14 14:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0251bec6690e73883a2b3dbaec680ba7 SHA-1: 96b70f841ffb5d2c4345bd3997d120d2d4ac9fee SHA-256: 43fc714199c0a0f6bd45ee6021c76fca4593ab6a138036bb66d37812b1972703
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The document contains an embedded URI pointing to 'jacksth.ru', which is likely a phishing or malware distribution domain. The presence of urgency language further supports a phishing attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=how+to+put+water+in+magic+chef+ice+maker
    • https://cdn.sqhk.co/noloxunipe/JgcKz0Y/love_story_movies_2019_download.pdf
    • https://cdn.sqhk.co/wexifidobafo/mmPTjbJ/35020278590.pdf
    • https://static.s123-cdn-static.com/uploads/4445116/normal_6002e4e9e6969.pdf
    • https://cdn.sqhk.co/nokotadi/3KqQiLp/30524766442.pdf
    • https://cdn.sqhk.co/kidurukazag/C61hebG/84408666991.pdf
    • http://lupuneruw.iblogger.org/geometry_polygons_worksheet_answers.pdf
    • https://cdn.sqhk.co/soxuvezosapa/ibYgegh/printable_rotator_cuff_exercises.pdf
    • https://static.s123-cdn-static.com/uploads/4385862/normal_600253bb9ca67.pdf
    • https://cdn.sqhk.co/tosobulig/aB3ibid/movies_online_free_app.pdf
    • https://cdn.sqhk.co/jukelifawap/geb9hgO/blue_cross_blue_shield_ma_find_a_doctor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/60ffa7f1-e7b5-468b-a8d4-aed931c527af/16884582230.pdf
    • http://jisidanosesozu.epizy.com/heroes_of_olympus_box_set_used.pdf
    • https://uploads.strikinglycdn.com/files/fcd8de6d-0a8d-411d-8661-0ea6fe0f750f/jubedafamatanexor.pdf
    • https://s3.amazonaws.com/wifukedot/metabolic_pathways_in_plants.pdf
    • https://uploads.strikinglycdn.com/files/32273adb-fe78-4d88-b65d-60062900f5ef/libro_metodologia_de_la_investigacion_sampieri_ultima_edicion.pdf
    • http://vibulowivez.epizy.com/senepofitaxuvo.pdf
    • https://s3.amazonaws.com/gimufesajo/aiou_solved_assignment_2019_free.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_off0000e620.bin
6acbf9c2bb95c044d9f2b93262b1cb8dc03f356cf127746fd9f2d0f4f7b9f98f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 5336 bytes
font_01_sfnt_off0000f837.bin
684a1148f31afe12070545c66916462bd4fe2d4db8dd2e5052060a3126957806
pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 10272 bytes