Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fcbd975263135d…

MALICIOUS

PDF

70.3 KB Created: 2021-02-24 18:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 076ea6714f8fabe8c389ec98aee2fc11 SHA-1: b83373299d355982dfb445a17325ae8cf8ce2960 SHA-256: 73fcbd975263135d1bd89293ca714f70d4e39a8811a61bdaf12ad4cacf93821f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential phishing lure ('baarspo.ru/strik'). The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for multiple links, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=big+nate+blasts+off+book PDF link annotation
    • http://elerctum.org/dixons_carphone_annual_report_2017_18tbxfx.pdfIn PDF document text
    • http://dubulus.iblogger.org/95220586947.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/jgcFgjY/mobugobixavulikoturin.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/hcjaiin/pizza_boy_gba_free_gba_emulator_apk.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/what_is_a_trustee_job_in_the_church.pdfIn PDF document text
    • https://cdn.sqhk.co/gabunufu/fiarjeD/space_rpg_3.pdfIn PDF document text
    • http://shoes-storie.club/ways_of_the_world_textbook_chapter_10i04yo.pdfIn PDF document text
    • http://taygerr.com/butterworth_filter_design_using_bilinear_transformationuchk6.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/what_is_the_core_conflict_between_capitalism_and_communism.pdfIn PDF document text
    • http://getdouche.xyz/what_is_an_ice_crystals_form_based_on49wbc.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/94949226117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekoraxevab.rf.gd/how_to_view_photo_library_on_icloud.pdfIn PDF document text
    • http://muxolisakij.epizy.com/mitutovubatesifaf.pdfIn PDF document text
    • http://wivifizurata.epizy.com/cbi_shankar_kannada_movie_video_songs.pdfIn PDF document text
    • http://karajifaderiwow.epizy.com/job_application_format_for_teacher_post.pdfIn PDF document text
    • http://xunevonobi.epizy.com/cisco_2960_switch_hardware_installation_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 5092 bytes
SHA-256: ebea8810523f8a19825518c97cb16fb34a0ac8e9b69ba5cc2f094efde3926834
font_01_sfnt_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 11112 bytes
SHA-256: 3f8f36f217935c94284aa8a0ea9f4fe9c9e0785638dc51858b1c0687a344ac5f

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