Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b9b0e2702e93c6…

MALICIOUS

PDF

77.2 KB Created: 2021-05-31 22:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7660bafa80e8df4ba510b502bdbee181 SHA-1: cd4d7cc3d047c640766c958ae80d4d9ee6a5454f SHA-256: a9b9b0e2702e93c670fb723270ea542e1f554db36a9371df1a72657081fd7178
186 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to various download sites, masquerading as legitimate software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing unwanted software. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://chcial.ru/pbw?utm_term=free+download+vlc+1.7+5+apk+for+android+2.3 PDF link annotation
    • https://garugufalavul.weebly.com/uploads/1/3/4/5/134507034/7926011.pdfIn PDF document text
    • https://jumitugiputetiv.weebly.com/uploads/1/3/5/3/135313018/zomapeguludoxov-gedagoritibapo-kagozegedezerex-kuraz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://volikedejefa.pbworks.com/f/kojelugetafaw.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/sotozaje.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144420204/baby_corn_snake_feeding_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6134c928-e985-4b5f-9df6-c5f9a23247fc/somewhere_over_the_rainbow_ukulele_easy_play_along.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af02575-dc37-4f44-baed-56a3b2cc5522/how_to_program_genie_garage_door_remote_acsctg_type_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dd4abf-1c9a-4a8e-86b5-7a2b7ac94950/sample_letter_of_recommendation_for_management_position.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/arunachalam_tamil_movie_download_tamilyogi.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/screen_recorder_with_facecam_and_audio_video_editor_apk.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/short_book_review_of_treasure_island.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361ac62f-3fc8-441f-ab69-3f49fa9a44ce/realtek_audio_drivers_download_for_pc_64_bit.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/2530776115.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144421644/un_lugar_en_silencio_2_fecha_de_estreno_peru.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144419445/bootable_usb_not_detected_macbook_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d66d78-cfd1-4e48-93f9-1442a050da91/how_often_change_braun_series_7_head.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/26708456432.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/fufabo.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/sezejejazesuxenusuwulax.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412272/how_to_hack_asphalt_9_on_android.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/sq11_mini_dv_kamera_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 5432 bytes
SHA-256: 27d164a8f8931ab9f25d2f2101d23cfe5e3688c96f906f614dc768c3524fe2d5
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 10248 bytes
SHA-256: dabf12d920b9ea54cc6f18b3d7e10a0e6c6aa0dc5740840f57f6cf3ed08eeafe
font_02_sfnt_off00011916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e