Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9b8e3b2ddb45aa…

MALICIOUS

PDF

84.1 KB Created: 2021-03-25 06:38:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec75fc9867737d529ba9588bf625f7a5 SHA-1: 9aa8a241819c5cb7bfbf2c239608253eba2db95c SHA-256: 1b9b8e3b2ddb45aa813c6e8a063a6cd5a41409f8fa3c83600a494deb4b7f1bac
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with the primary one being `https://jumiwimov.ru/wix?keyword=is+trophy+hunting+good+for+the+environment`. This URL, combined with the heuristic firing of 'PDF_SEO_DISPOSABLE_LINK_FARM', suggests the document is designed to act as a link farm or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/wix?keyword=is+trophy+hunting+good+for+the+environment
    • http://top-agent.ru/zozazunemulupowabk5zxv.pdf
    • http://lorutupaxuposu.22web.org/negative_exponents_worksheet_kuta.pdf
    • http://hq-cleartv.info/the_white_tiger_review_guardian1qwuk.pdf
    • http://uaportal.site/bloon_td_battles_mod_apkhdluf.pdf
    • http://tifimazupidad.iblogger.org/integral_calculus_book_download.pdf
    • http://mesanezedid.mypressonline.com/29381503472.pdf
    • http://wibofot.22web.org/4700995443.pdf
    • http://wimuzawoxi.getenjoyment.net/78519825214.pdf
    • http://cocobuka3.xyz/39418580978d57wu.pdf
    • http://rusherx.studio/how_to_calculate_penalty_interest_on_loan_in_excel0iqbp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nefunupu/suremitusonukuv.pdf
    • https://s3.amazonaws.com/safago/16336646381.pdf
    • http://merizipu.rf.gd/echo_srm_2100_rebuild_kit.pdf
    • http://nudenagazosizav.epizy.com/septanest_articaine_safety_data_sheet.pdf
    • http://tuninedup.epizy.com/tecnologias_de_la_informacion_y_comunicacion_libro.pdf
    • https://uploads.strikinglycdn.com/files/a97698f1-0fbc-4298-b5c1-eef0f2a5e8ab/super_bass_portable_speaker_bluetooth.pdf
    • http://laraxeramamat.rf.gd/tutorial_sql.pdf
    • https://uploads.strikinglycdn.com/files/a3522a67-3dad-41f0-9e9f-e7fa1bd9b3af/51361576307.pdf
    • https://s3.amazonaws.com/povelenavuviw/jinujopivaxazup.pdf
    • http://rabudigika.rf.gd/cambridge_english_empower_for_spanish_speakers_c1.pdf
    • https://uploads.strikinglycdn.com/files/3c625eb6-2e38-431c-8fc2-4c2f22796e50/how_much_is_the_salary_of_a_microbiologist_in_nigeria.pdf
    • https://uploads.strikinglycdn.com/files/2a58e927-d758-47ef-a31b-dd5c508e78bc/the_christmas_carol_2019_episode_2.pdf
    • https://s3.amazonaws.com/foneniz/5079450820.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_off0001099d.bin
ba1c70f203e0895775489d5e2225974c180498c011cbfa3416287013fd60261e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 5312 bytes
font_01_sfnt_off00011b9c.bin
db7f925d23015095bf6c2e996c900ebebbbd4bb72faeb11f2bb16b7440b970bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 11756 bytes

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