Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce09718b63242b18…

MALICIOUS

PDF

78.5 KB Created: 2021-03-21 07:33:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7b685cca9846cc025dbd1ee8ddfa2376 SHA-1: 10515c11a2869c92530c638aad7260587607be12 SHA-256: ce09718b63242b1840657e1fed58604fffba6e7e438719c43dbc6d01e755fd17
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 0.9992

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://vilenefex.ru/strik?utm_term=moultrie+m80+hard+reset PDF link annotation
    • https://rikekipodoze.weebly.com/uploads/1/3/0/7/130776447/2831366.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/basic_english_tutorial.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/buxbaumia_viridis.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/zapelipo.pdfIn PDF document text
    • https://solebuza.weebly.com/uploads/1/3/1/4/131453496/fogodarobikine-jixojujemofa-rizuwafiv-juxalavune.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/which_metal_is_the_best_conductor_of_heat.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/nadumabujag_girenop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_85e6c96658844285903e4ba196ebe4cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/855bcc7f-9a84-4efb-a88c-4006d12fd982/the_hobbit_3_full_movie_in_hindi_download_720p_worldfree4u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d097ff-b0da-4a2b-aac9-554509180f73/principles_and_practice_in_second_language_acquisition_trke.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_4f4a5a5daa954961b6448e7c067eafce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ebe865-1483-4adf-8e79-d9cfe136aeb4/79021714666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227ed925-0507-46de-a0be-e67875bcdaa9/mataburuxufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73abc596-67bd-405f-b6bc-f9ed42298cb7/knex_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75417c1-3425-4a90-b0d7-6da79fea9974/i_am_zlatan_ibrahimovic_goodreads.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/janesenopafemaravemiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7304cf66-69c9-451f-b036-205fb19eaee2/stock_index_market_futures.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/75580555913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c488f3c8-389c-408c-a01f-a63d4254dbfe/parks_and_recreation_season_1_episode_2.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_d4de7dece5ec459db5fe00629ada5910.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26081f32-db78-47ea-8cea-bf5b3ba6d822/12829745297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1794d4c7-7fa2-4d37-9d47-44e71e2f27dd/class_11_pol_science_notes.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_cc1d51efa90b4004a16569b0d52c0c5f.pdf?index=trueIn 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_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 5404 bytes
SHA-256: 6b56b66d5f9052fc90291c9934800509d79d6a939d5ed0f1d9395d3d04850172
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 10588 bytes
SHA-256: da0914d9b0b701b855d285da5129643f45d14940b04939d2324c97966821b839