Malicious PDF — malware analysis report

Static analysis result for SHA-256 1230f1ea193463e0…

MALICIOUS

PDF

71.6 KB Created: 2021-04-02 19:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8ad80413f51630a48b08f695be3d31b2 SHA-1: 76216d30f7903d1ab2f86a5fb5f56fb892244e4e SHA-256: 1230f1ea193463e01875d7509665a650938820232492320cd423ea59531441e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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=american+english+file+book+2+pdf PDF link annotation
    • http://xenalebosob.scienceontheweb.net/xagerifuresitalutubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_6031ced3bf3d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_602264f1c24ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5fd1222355520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_6063da4dc3194.pdfIn PDF document text
    • http://lozuzaragujeb.mypressonline.com/1439071106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_5fe7210574c24.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/fundamentals_of_arm_wrestling.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulopekusape.atwebpages.com/furukapuloxilibima.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/malaysia_airlines_mh370_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d456b39-9312-408c-9f8a-9f7d73b3e029/wepazetawefasizexin.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/epson_workforce_2630_ink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da393fa-6a0e-43cf-ba43-24fb2ff4f672/kosedewovadisapufafeba.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/python_programming_language_syllabus.pdfIn PDF document text
    • http://foduxidepozipiw.myartsonline.com/30227606567.pdfIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/4593197084.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/66920346226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23617b50-61ac-4be5-b984-32c4168ac239/87395970487.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/detoledolapaxalut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc1f35c-226c-46b8-b996-dc7b256f450c/49129300309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceba64e5-4eaf-4b46-b76e-42a4e85c08ef/82565309285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2093dae-7b2e-430a-aabb-381e00bdc7e8/what_is_an_example_of_a_quasi_experimental_design.pdfIn PDF document text
    • http://wilosokanik.myartsonline.com/biodiversity_loss_and_its_impact_on_humanity.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_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 5896 bytes
SHA-256: fbb6eb4dca5118d29173de7731721a9ceb29c3b5fc2556903e3e0658bcd77180
font_01_sfnt_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 13084 bytes
SHA-256: c0f57d4de67abbe789b2af7b76e04119c423ae5a6425ddd11607e6955b3f43e5