Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9551ac44255ba7…

MALICIOUS

PDF

73.4 KB Created: 2021-04-24 13:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3ff9bba0b156530a740252019f3f195f SHA-1: 3e2fcdb3ca2384c8e25211a97090cf2088de53e4 SHA-256: 8b9551ac44255ba7de611edb9c4426e212e53d6c70a88a2491c6afb39d1f39ba
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, appears to reference a printer manual, suggesting a lure to trick users into visiting the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=brady+tls2200+printer+manual PDF link annotation
    • https://cdn.sqhk.co/muvasesuru/kqtRCXU/w_4_tax_withholding_worksheet.pdfIn PDF document text
    • http://businesslinecenter.com/bivojubug1n5b.pdfIn PDF document text
    • https://cdn.sqhk.co/gufulixofoma/BgehbEE/python_format_list_of_dictionaries.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/9jgicoj/womusiredaxefexepi.pdfIn PDF document text
    • http://kvrovk.xyz/acche_vichar_imagetl5z5.pdfIn PDF document text
    • http://pipvip.ru/logan_paul_no_handlebarsl2szn.pdfIn PDF document text
    • http://tersq.fun/midnight_sun_tanning_near_mervegy.pdfIn PDF document text
    • http://wozonos.22web.org/five_ten_climbing_shoes_sizing_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/QAibqFT/nawufilomowaxigemube.pdfIn PDF document text
    • http://xekinivafu.iblogger.org/actualizar_whatsapp_plus_2019_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/Y8q3hht/34885160791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jixoxila.epizy.com/os_grandes_economistas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7da17d8-54dc-4b8f-ad13-235e18695fc9/tokepolejifododujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dfb567-61c4-41f5-b421-90d26b9d1043/mathematics_book_for_class_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b790c8ba-f8c9-44f3-9150-127a4f19f968/the_7_habits_of_highly_effective_families.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ebfc7ce-96a3-44a7-a8db-0f73eb27af83/what_would_cause_bloodshot_eyes.pdfIn PDF document text
    • http://fanurumuge.epizy.com/professional_photo_background_images_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7944b839-8e13-4b6b-9926-2c881b2ef189/how_to_use_ti-36x_pro_scientific_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a735971-135c-4176-8d7b-48e4677f5fbd/caloric_gas_stove_heritage_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13528be2-b6a0-4a5d-9632-76effae1d673/xipajigukerosemuvewajujep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4176295e-7b41-4f99-8eb3-6474fb013d91/how_to_become_an_amazon_writer.pdfIn PDF document text
    • http://xovipofeguz.epizy.com/gagonavikiwuberenofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16ca044-8624-4e56-8493-1c8c5a4f86bb/how_to_start_st_croix_pellet_stove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2469c3e-3f65-47ac-80a1-da7c36d5f58f/what_is_the_best_mini_refrigerator_with_freezer.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_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 5532 bytes
SHA-256: e0f5041a5e923c8bec8f3a52b061efa73483bd612376e913668cad155bffa010
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 11288 bytes
SHA-256: af68e57fe19912b996ef1dbd17bff6bef6235131ff6603f350a7a423e7e6afa7