Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29f2d8f467a9501…

MALICIOUS

PDF

83.8 KB Created: 2021-03-15 19:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f08d631f9349a93feddc286590f0c29e SHA-1: b9c8a7de048dc19306ffffea475c59e9fb810a8f SHA-256: c29f2d8f467a9501f812ce8db8298d6dbf5f38d334dbe8fe2014449393f16e7d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary URLs, 'https://zajinet.ru/award?keyword=chuy%25E1%25BB%2583n+file+pdf+sang+phai+%25E1%25BA%25A3nh', is flagged as malicious. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://zajinet.ru/award?keyword=chuy%25E1%25BB%2583n+file+pdf+sang+phai+%25E1%25BA%25A3nh PDF link annotation
    • http://lastmarkt.ru/jspdf_autotable_table_width3gj1n.pdfIn PDF document text
    • http://macsk.space/free_sheet_music_flute_disneyuh2fi.pdfIn PDF document text
    • http://spindlndou.space/maze_runner_-_il_labirinto_streaming_film_per_tuttiddxse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc287695-766c-4244-89f9-e23011bfa843/wendys_menu_items.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b4583f-d635-4024-b80f-667b1bb542c7/how_many_dummies_books_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7ca379-863b-4f4b-95cf-8fe0c408e32b/nutone_intercom_system_with_cd_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288b4eb0-ad04-4550-b40e-d15d10a065b5/27948920716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8571d68-5ca3-4cd4-8d48-939d9f2ccfe3/remmy_valenzuela_mi_princesa_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf3ca08-5696-464e-b7d3-9032ee0c504a/what_episode_does_elena_and_damon_dance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc563fa1-18d8-43b9-b520-c9de64a9e789/xufurabijigur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2994113-eb17-48e7-940e-65fc7578fd1c/2019_honda_pilot_maintenance_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4944a7f-f813-4a80-b967-ab3286241b38/golf_is_not_a_game_of_perfect_audio.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_ffe668580d494a30b822e17cb1813c2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3d9659-0162-4f5f-a877-7ca2f973c315/how_long_do_razor_scooter_batteries_last.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_c20930c261dd41ad81e20cc42a7638de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78492d51-4106-434a-b4f4-69087c215fc0/barra_de_sonido_rca_rts739bws_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/166ffdae-b606-4cb2-a76d-3044b2979a8f/does_ue_boom_3_work_with_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652b6b96-8257-45ba-b446-d2f6f88c00a9/worijuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79dd6e7b-aa48-4854-99b7-94ed90948c2c/jawbone_mini_jambox_website.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_ee71ce61548a48d796ea1bb32bd361e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d43c76d0-5d6f-4046-b00d-8b9da4946964/why_would_a_samsung_refrigerator_leak_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ccfd0d1-62ab-4b2f-93bf-7171d4ffa4fa/will_physical_therapy_help_plantar_fasciitis.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_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 5688 bytes
SHA-256: be49f34a9e5d10c660cbb24a84a6c84b09aeaa364c017e40047408b44b726763
font_01_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 22872 bytes
SHA-256: 61df4315bbe47166c532d7d4556477c403171ff603463e6f27d384e7df064484