Malicious PDF — malware analysis report

Static analysis result for SHA-256 475a3f2e07a859f2…

MALICIOUS

PDF

82.7 KB Created: 2021-05-27 08:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf28bcf31c782200fca0dfccee21806f SHA-1: 70094cc61b5604d219027e682e170f14db176a0b SHA-256: 475a3f2e07a859f29ce1e58575230f53df35c5bad0a4022320cef77f311d6286
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/strik?utm_term=free+download+terjemahan+kitab+al+umm+pdf PDF link annotation
    • https://dirukarizudabi.weebly.com/uploads/1/3/2/3/132303081/455394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_601d1aeace351.pdfIn PDF document text
    • https://duguzimelape.weebly.com/uploads/1/3/4/6/134666192/ganeniriganutexav.pdfIn PDF document text
    • https://rewodudifizaba.weebly.com/uploads/1/3/4/4/134475466/fifelen_disajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_6038d102d6ba9.pdfIn PDF document text
    • https://mimedotaxejibi.weebly.com/uploads/1/3/0/8/130873786/1884044.pdfIn PDF document text
    • https://suzulazupe.weebly.com/uploads/1/3/3/9/133997697/4327105.pdfIn PDF document text
    • https://xojurumute.weebly.com/uploads/1/3/5/3/135328527/tiriwavowenojun.pdfIn PDF document text
    • https://biwimukapol.weebly.com/uploads/1/3/1/3/131398517/9546368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_60601b7c75316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_5fda5d3692547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_602e6cdd47f36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5d7158-cab5-4d6a-bf4d-69599c112ad6/how_to_write_a_really_good_rap_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9921fb39-87b7-4277-9554-d968c0f263bf/ejercicios_multiplicar_y_dividir_por_10_100_y_1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debfa803-64cc-47df-ac9d-0825e7a1847a/dyson_dc44_animal_battery_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f052a1-67f3-4496-957a-6b4a90270947/printable_times_table_sheets_1-12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e632456-2e87-4b1e-b757-9c19e4ec4ea9/32934473854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de5953b-afe1-4d5e-9cdc-385b638c19be/omnisphere_2.6_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0e08dd-f38d-4f7d-b06a-be18948f2c22/agatha_christie_best_books_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8986c99-8b83-4bb7-9806-80a68372bc4d/star_wars_rpg_edge_of_the_empire_beginner_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54adafbf-dcf5-468a-a3e6-1406dd7a0a74/thinking_maps_training_calendar.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_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 5432 bytes
SHA-256: 745aac9fcd9ee7ad6c6fcae729cb349c80a280a1a962e96437eab9c28f2ad23a
font_01_sfnt_off000118ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 10788 bytes
SHA-256: 8c53bb27ffe6300ef2976ed9457a01635f926f3d524511ecc0ff7ccfa7801d17