Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28f072edde36db2…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 04:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8acd6af5c3cdb7262da527249c094ca5 SHA-1: 8f26af32ac335b74ad1c5734acfafc76bdf5f9ab SHA-256: d28f072edde36db2e63c8618f8534b19668ec68cee15a907e0e79cc5464f2a72
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. It contains numerous external URLs, with one specifically pointing to a suspicious domain 'seumenha.ru' that appears to be part of a campaign to generate traffic or distribute malware. The ML classifier and ClamAV also strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=honda+generator+eu2000i+oil+type
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/nalunofugikufada.pdf
    • https://cdn.sqhk.co/votexeruwiti/ibiaSgj/megabus_dallas_to_shreveport.pdf
    • https://cdn.sqhk.co/peluxisomex/gXHYicQ/thrifty_car_rental_airport_boulevard_los_angeles_ca.pdf
    • https://cdn.sqhk.co/kurafuso/jSBtjfc/white_noise_generator.pdf
    • http://zuregazezoral.mygamesonline.org/kozagufe.pdf
    • https://cdn.sqhk.co/xazolilatu/Wjjj1hf/mirojojiwidavevug.pdf
    • https://cdn.sqhk.co/potasuregoz/Fhg8ghk/feed_the_zombie_game_ps4.pdf
    • https://cdn.sqhk.co/kupujape/ajgibhh/nba_g_league_salary_tryouts.pdf
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/8568180.pdf
    • http://sevagawos.getenjoyment.net/faroruluvakopulujafogas.pdf
    • http://nurigoluda.mygamesonline.org/vocabulary_workshop_level_e_answers_unit_3.pdf
    • https://cdn.sqhk.co/nezusoxe/gn38gjq/fosirewelu.pdf
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/kejotutariliw.pdf
    • https://cdn.sqhk.co/gojelonub/ghbtOja/warship_battle_hack_app.pdf
    • https://cdn.sqhk.co/madumubo/BBgjijI/stock_market_simulator_no_sign_up.pdf
    • http://novazeku.mygamesonline.org/29921758739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d509554-3a21-4b72-8c4e-273790f2f063/should_ethernet_be_capitalized.pdf
    • https://uploads.strikinglycdn.com/files/c12d711a-b42d-46fe-96d2-aedd796158ce/what_is_the_best_routine_to_build_muscle.pdf
    • https://s3.amazonaws.com/wulotugadag/kajipopotipogulujafezaje.pdf
    • https://s3.amazonaws.com/sizadagazagaj/how_to_prepare_for_quant_interview.pdf
    • http://seroroxunabolu.onlinewebshop.net/95411837049.pdf
    • https://uploads.strikinglycdn.com/files/10afaa3e-6ed4-4ab8-ba6c-d9e85c422c17/57070512726.pdf
    • https://uploads.strikinglycdn.com/files/a852f52a-3825-4785-81ac-0d472970892e/39610061018.pdf
    • https://s3.amazonaws.com/wekibik/autonomous_vehicles_book.pdf
    • https://s3.amazonaws.com/xeruxaxer/free_emulator_king_games_for_pc.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_off0000f347.bin
aef05dbc501cd3e416fd53920c0bec357851adf748e50cf2f6fa05356cceff77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 5284 bytes
font_01_sfnt_off00010556.bin
7010885f7b716c37c2f2d10380ceb0078e18a62d9d2e834ee8e81876e8bd5a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 10552 bytes

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