Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a657d6649ec1ab5…

MALICIOUS

PDF

74.2 KB Created: 2021-06-05 17:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d8e3b536a1a278dd3aae5755fcb62d0f SHA-1: cde2fe5b9f2d835d3e88290a8278dc624ed8c80d SHA-256: 0a657d6649ec1ab531a94815ad8fc7adbaf1ef2a13750e8bfe4177e801cc58f7
186 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many pointing to disposable hosting and exhibiting characteristics of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://kuzutuzo.ru/123?utm_term=orbit+er+4.+1.+1.+19+filehippo PDF link annotation
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/nejepuki.pdfIn PDF document text
    • https://veburuja.weebly.com/uploads/1/3/0/7/130739173/bomutobo.pdfIn PDF document text
    • https://juruditusevowe.weebly.com/uploads/1/3/5/3/135329261/namupak_bonosanikefa.pdfIn PDF document text
    • https://vuduleputasi.weebly.com/uploads/1/3/4/4/134488699/6567970.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/6f1c2a3e5e02325.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/d10eac8b-3f09-4e42-adc6-94af447f3228/3073828490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00529ea-5c40-4cb4-8fa7-19bad2f24b0e/61662634389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f8ac85-0d68-40a6-bd9c-3220af8aad43/pete_the_cat_four_groovy_buttons_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364d94e4-3143-497b-89b8-46ea983f4cf3/what_is_c_class_ms_pipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c797ede3-3c84-4543-8990-1f13a8c9d59e/dell_inspiron_6400_video_driver_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb287c5-9872-4dcb-ac47-93d7ea7a51cc/15427637848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49153358-bebc-43f0-83e6-c95da3296bdf/confidence_fitness_under_desk_v2_treadmill_electric_motorised_walking_machine.pdfIn PDF document text
    • http://joriguzo.pbworks.com/w/file/fetch/144668310/how_to_turn_off_kidde_co_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9913c097-df22-4d5e-a0aa-91825c0d1497/everybody_lies_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a58a1df-7272-454c-9891-d14af0196db5/hayward_aqua_logic_control_panel.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144525912/employee_attendance_sheet_in_excel_for_office.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_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 5096 bytes
SHA-256: 57f34adc84cc5a434ce122ae49f8492c29c12f48d1338abf3a63092e7cdcb930
font_01_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 10560 bytes
SHA-256: 17db5f6a496b3f0c7a4d3ebba2225de549987b78df863890cbe9d51826440f6d