Malicious PDF — malware analysis report

Static analysis result for SHA-256 62591cac5c0f7302…

MALICIOUS

PDF

80.8 KB Created: 2021-04-03 02:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c8d11f90021fe86578199a593075d7e5 SHA-1: ede1e9e1c39956a0a514fc1c13a65ea03df2045a SHA-256: 62591cac5c0f73027a59ea55213d548a9259eb8fa62ee31025c4463c11014b3b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to sheet music, likely serving as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/award?keyword=fur+elise+piano+sheet+music+pdf+beginner PDF link annotation
    • http://tesupelaj.sportsontheweb.net/cardiac_arrhythmia_management.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_60518b63b1a47.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/ts_16949_documentation_requirements.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447251/normal_60092607e944e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454679/normal_6007c505b16d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_5fe7f4bd3b5e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_603a0b471ae57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5fc79583a2142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_60364abdcd2d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417643/normal_5ffc63390999a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_601306524028e.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/92ee5232-1829-44ab-a288-b1148cf83e33/poem_books_about_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bf5a8f-2dca-4106-afd4-f1f2d7afd291/41275798273.pdfIn PDF document text
    • http://kopolug.myartsonline.com/what_is_gender_and_development_approach.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/jogoku.pdfIn PDF document text
    • http://ruzakema.onlinewebshop.net/compressing_files_illustrator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/030e7e55-45c7-4ba7-b7ae-0b6de4bc20fa/vetesogigeluwatabupim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535cd225-d22c-4b9d-a2a3-0a07e4932d7d/brother_cs6000i_60-stitch_computerized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91abded6-a2cf-43f7-b10c-a7a145da2e4a/genie_pro_stealth_garage_door_opener_remote_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413dabec-be2a-4c34-b7c3-61c6077a7ddc/biwuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a49208f-06f4-4ecf-9556-2f07ea20d58b/xekurizabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f79e88-a58f-4751-9cc0-a721b58bfaca/2006_ford_e350_service_manual.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_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 5664 bytes
SHA-256: 92c3ca77eeec1ce32ef6e80c93e45bc9b0f9e3b72b4e17e3fb3454f906582809
font_01_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 11156 bytes
SHA-256: 57eda271c45359f75238291dafdc8dea3a7f8fb245e39cee5d763d321b092f01