Malicious PDF — malware analysis report

Static analysis result for SHA-256 e517b056596ef871…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 19:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b9041b7db51883d35991bc40de30b0ba SHA-1: 9945d51763f2c353c4fe88de50ee0dfb34bcee96 SHA-256: e517b056596ef87165fd9bc60a6ed5a44b02aa65dc8acca41b937af6ae2d66f1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xezojetit.ru/wix?keyword=toshiba+tv+owners+manual+download PDF link annotation
    • http://kudretbozaci.com/free_gems_brawl_stars94qjk.pdfIn PDF document text
    • https://cdn.sqhk.co/fusifanux/agjQhgA/isaimini_tamil_play_hd_movie.pdfIn PDF document text
    • http://udilische.club/baal_veer_title_song_video8heln.pdfIn PDF document text
    • http://pedalini.club/annual_report_meaning_in_arabicx0jev.pdfIn PDF document text
    • http://raifaisentapp.online/94685598058angeo.pdfIn PDF document text
    • http://stavki-na-sport.site/tesemosapipefepll9ls.pdfIn PDF document text
    • http://instacopyrightcenter.com/video_games_online_store_canadasnhht.pdfIn PDF document text
    • http://harmony-market.ru/how_do_i_change_the_filter_on_my_kenmore_ice_maker7hwhz.pdfIn PDF document text
    • http://momentshop.website/rajasthan_3rd_grade_teacher_salary_after_probationfve2r.pdfIn PDF document text
    • http://skidki-day.site/puzzle_bobble_2_character_select5s2el.pdfIn PDF document text
    • http://mixed-rootwork.com/tkstar_mini_gps_tracker_reviewfaei9.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/WTiOA1D/vitamin_c_supplements_for_skin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_03fb19d53b7b4774ac4e1fcb2b3636ff.pdf?index=trueIn PDF document text
    • https://9d48c282-f5c5-401e-bfd6-6fab4213a9fd.filesusr.com/ugd/f96b02_e3b59b245ddf4bd9b0bbe274aac40e72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/979a5188-0819-458e-a8e0-e3dce5077ca5/gone_with_the_wind_book_jacket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf78692-47c4-4d30-a83e-173bbc6a7913/tonsillitis_viral_or_bacterial_how_to_tell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eceb2358-5f12-4506-80f3-67cea66016a0/how_to_use_garmin_marine_gps.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_992529378f904f829322751957029d3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51f2d41-6fcb-4a3e-a10b-99add8d2fd0d/oracle_sql_advanced_select_statement_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b142cb-aac3-4591-b427-1a764546c853/sizaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d48c7c-bbc7-4196-8ac7-9bab82954a7c/galosinogawosivu.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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 5308 bytes
SHA-256: 6697d7392a39bcfab2bc45f5889144254f0fbaf208bbb841f9574f2d13980da6
font_01_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 10936 bytes
SHA-256: 8769120b7de42870b3bdd9ef479635ba318be7a85e79e16c9fb9842bafc2a6a5