Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c3eeb7329d9cf7…

MALICIOUS

PDF

93.1 KB Created: 2021-06-07 04:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e31498ceffb7c25cc7b33e00520e1cfc SHA-1: 3d7b520e451c2e9e2d0752d4c98503100f532e96 SHA-256: 36c3eeb7329d9cf79f53d0307d12c7b588392b3371e59d102de25a29c267ed20
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, with one prominent URL pointing to a potentially malicious domain. While no scripts were explicitly extracted, the nature of the PDF and the presence of embedded URLs suggest it's likely used for phishing or to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/pbw?utm_term=ccna+2+chapter+3+exam+answers+v6 PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144434661/free_printable_color_by_number_preschool_christmas.pdfIn PDF document text
    • http://giribuv.pbworks.com/f/how_to_get_pulse_secure_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edec0ddf-31f5-46a7-881e-8d78af940da0/what_is_the_warranty_on_schlage_locks.pdfIn PDF document text
    • http://tedadopite.pbworks.com/f/rojisamazup.pdfIn PDF document text
    • http://vevokofeju.pbworks.com/w/file/fetch/144656841/mobawakunupisev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99c7fcd-a064-4dfc-80f6-79a4eda8ec10/osha_10-hour_construction_safety_and_health_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ca3815-6091-4216-8ab5-25a2de56a11d/la_bella_ceci_y_el_imprudente_capitulo_3_dailymotion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f57cbe4-fcc1-4477-9448-b56e8367d9f9/kosetogonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59758df4-2a93-4aa1-aeaa-d3f11a6173e4/how_to_prepare_for_a_behavioural_and_competency_based_interview.pdfIn PDF document text
    • http://rimogeto.pbworks.com/f/how_to_clean_honeywell_humidifier_without_filter.pdfIn PDF document text
    • http://kevukimugo.pbworks.com/w/file/fetch/144602016/xatisigawefajuki.pdfIn PDF document text
    • http://luwivaj.pbworks.com/f/samsung_galaxy_tablet_10.1_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b726d22-efab-4448-bbcd-0d7488129691/what_are_the_5_themes_of_geography_and_why_are_they_important.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/diary_of_a_mad_black_woman_free_full_movie_stream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a181b2-1047-49d0-b0ea-367dbb5276c7/metal_gear_2_solid_snake_nes_rom_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b284a06-3279-4433-8b18-b1178458e19b/behringer_xenyx_1202fx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0ce173-6354-4927-b499-f21c1b18ec04/sword_art_online_anime_series_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4231b475-4532-4e49-adb7-ac9384bb395f/good_books_like_48_laws_of_power.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/f/74610401807.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_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 5716 bytes
SHA-256: b345958c2cc79332556c12198b49ee4da400283935591ff3e8a6c16c9c795acb
font_01_sfnt_off00014129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14129 11452 bytes
SHA-256: bf8079bb0e25387a016d7e6a86442d762ccfc67bf2b028545e31cc166168364a