Malicious PDF — malware analysis report

Static analysis result for SHA-256 577ffb9eec2301f1…

MALICIOUS

PDF

77.6 KB Created: 2021-06-01 17:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6f80ad3e6024e769a37ab7e4e308d980 SHA-1: ca1daa6a6aa981a19736fc99d5537c331d7c4c50 SHA-256: 577ffb9eec2301f1fef51049c826585ff2880b5e1120a8b17bfae2c94457fb5a
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://medvor.ru/pbw?utm_term=dropbox+packs+la+paz+bcs PDF link annotation
    • https://vuzeruferule.weebly.com/uploads/1/3/4/5/134591890/subizo_semilonodiwiz.pdfIn PDF document text
    • https://walotowujiko.weebly.com/uploads/1/3/4/5/134582573/43c4b73fa452647.pdfIn PDF document text
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/tonusevenizul.pdfIn PDF document text
    • https://zopojidiluze.weebly.com/uploads/1/3/4/3/134361294/d8f47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4e6c2f30-0301-4056-8f39-463b3471b736/zenagajodiraminexuxevize.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/f/happy_new_year_esl_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2cff33-ec01-40f2-b687-33cfc7a03261/ryobi_10_table_saw_replacement_rip_fence.pdfIn PDF document text
    • http://garigor.pbworks.com/f/grams_to_kg_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777d589d-3a90-4653-ae4c-703a4eb08d9e/51692158574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2b8eed-ad8c-44d0-b33e-393e8ca1b70b/72058073655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585fd85a-0d5b-4376-9bbb-72b900f69527/honda_cb_450_nighthawk_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ed24a8-51cf-48da-b2ae-4037ea7a0761/47341360611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81613692-8e93-4017-951b-64cfa42b96bc/5131825053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313295c7-fb4d-43a3-b987-b687f736ed44/zadule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb43c697-6e09-4b36-8c88-9aa7ee618905/chicco_keyfit_30_infant_insert_install.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d3e33b-263d-450f-8bf9-8d64e242abe8/xunifevuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c621ae6-2a56-4763-a0fd-eeefb82f76c0/clicker_garage_door_opener_programming_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a09dd07-80d0-457d-b2a2-e101d06355a0/tewijexunuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b2709a-77d9-40b3-802f-96e4d772299b/how_do_you_find_gold_in_rocks.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/crash_course_government_and_politics_3_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3c6b84-f463-4050-83b3-5610aa8e8136/swann_thermal_sensing_security_system_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42ec7f6-5dbf-42b9-8918-7d8ad3b78f20/hbs_1100_vs_1120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f22d5e8-8662-4854-8f6e-c66442b30671/22684833298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe17bd90-cbc5-471d-8eea-889bed3d2c96/rezadarevadatej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 4684 bytes
SHA-256: dc43873b9b452ae0fc8bb5c9acbd1b8409e3c26cfbfa4ebaa8122f82f5b2434d
font_01_sfnt_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 11772 bytes
SHA-256: c4aa6d5a0f3694b9b4b701497711798112e2cbedbc446228e5c090b2e4155504
font_02_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3