Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e7cb6b8947e5e7…

MALICIOUS

PDF

145.8 KB Created: 2021-06-08 16:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e0aa7bbaf4be00deba90462fa3a458f9 SHA-1: cfd5589ff4502e3b2ba87755cd9cfd860e628080 SHA-256: 89e7cb6b8947e5e709730909a0e1e264e6930b83eded6cab99f580bffdc053e0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion identified as a link farm on disposable hosting. One prominent URL, 'https://wastran.ru/pbw?utm_term=cheat+dls+19+%253B+50+%253B++%253B++%253B+Low+%253B+0', is flagged as external and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://wastran.ru/pbw?utm_term=cheat+dls+19+%253B+50+%253B++%253B++%253B+Low+%253B+0 PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144562914/fahrenheit_451_part_3_test_questions.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144647868/what_is_the_henrys_law_constant_for_co2_at_20c.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144459516/financial_statement_analysis_and_security_valuation_stephen_h._penman_mcgraw_hill.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/watch_free_full_movies_no_sign_up.pdfIn PDF document text
    • http://wenitat.pbworks.com/w/file/fetch/144552180/tf2_unboxing_sim.pdfIn PDF document text
    • http://pusavivo.pbworks.com/w/file/fetch/144442926/shahih_fiqih_sunnah_bahasa_indonesia.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/kawasaki_kr_150_wiring_diagram.pdfIn PDF document text
    • http://pesivop.pbworks.com/w/file/fetch/144632499/free_hanes_t_shirt_design_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391bbecf-21a3-4041-9eaa-dfab64bdc4da/10924957987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb2a78b-eaf8-4dc5-819e-cf3181ded897/python_programming_book_bangla_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0c06c2-2ed6-4b82-8d3b-0f73e64cd19f/how_did_alliances_help_lead_to_ww1.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/w/file/fetch/144440073/writing_task_2_ielts_general_2021.pdfIn PDF document text
    • http://najapenoz.pbworks.com/f/36911540281.pdfIn PDF document text
    • http://pevaludim.pbworks.com/w/file/fetch/144871143/how_much_does_a_5500_watt_generator_cost.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144752970/paturigovi.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/w/file/fetch/144795906/wh_auden_age_of_anxiety_quotes.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/f/vuvugi.pdfIn PDF document text
    • http://nenikobowon.pbworks.com/w/file/fetch/144796308/download_black_panther_full_movie_in_tamil_dubbed.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000220c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x220C3 16664 bytes
SHA-256: 7793cc8f0cb53f09fcce51159bf52fc768947e9d6128a15ab503e00d9f4c3583
font_00_sfnt_off0001b768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B768 4016 bytes
SHA-256: 627f968d7373b4b887e15b53a4caf392a26552efa08feb4d468b5212d88782f7
font_01_sfnt_off0001c596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C596 5392 bytes
SHA-256: 539ec5c4f4e8305c334e3dfb818fd24e327ac2869a5a866062c6d646d55943c8
font_02_sfnt_off0001d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D803 7020 bytes
SHA-256: 1381fcf226082180be5e5e3250d8499704571008e170fbe547cade87a039e536
font_03_sfnt_off0001e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E99A 18220 bytes
SHA-256: d9449aade5cce98c90ae30b5b565fb6fff1e293de612b208dd95f6969aaa4812