Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc217771166bc921…

MALICIOUS

PDF

81.5 KB Created: 2021-03-22 06:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6d2f764d3967afc3fcf03da4064aee33 SHA-1: 10cadaa2a5f4ccd80fbd91998f2e63a59c67f3a5 SHA-256: bc217771166bc92191a2adaab0a030d36b98b5fe11a7a1daf33cb7f67ddc7df6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or used for SEO purposes, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=stellarium+mobile+user+guide PDF link annotation
    • http://lunatan.medianewsonline.com/apprendre_a_ecrire_en_francais_maternelle.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/bio38uA/colleges_with_viticulture_and_enology_majors.pdfIn PDF document text
    • https://cdn.sqhk.co/gavivevok/hG2TcXB/nusabiki.pdfIn PDF document text
    • http://ravapusevuj.iblogger.org/simon_companys_year-end_balance_sheets_follow_2017.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/business_english_letter_writing_phrases.pdfIn PDF document text
    • http://zitojesudesidaj.22web.org/2518544177.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/b5e87546-adf5-4d2c-a423-b106f6e7c6d8/5305335523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41182b88-f089-4ffc-b86c-e367225e4814/what_do_yellow_sunflowers_symbolize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11030471-5e8d-4f96-8d40-5f1506efd533/the_endless_river_best_songs.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/24177016028.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_27d32a641ad5492c93355823385a4990.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3115ce3c-9acd-47fa-9268-55e3dc271bb8/angels_and_demons_dan_brown_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c036c5a7-9aaf-4963-9416-7e7d793413fb/how_do_i_connect_my_wireless_printer_to_new_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2d23c7-41fc-4181-8708-4d8ac92a6528/proving_trigonometric_identities_worksheet_with_answers_doc.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_4695e06066c0462abe922c4191426d56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1bdfba6-1f07-440b-931f-87d1fa91094e/eternal_water_heater_e27_error.pdfIn PDF document text
    • http://xasiruzate.rf.gd/que_es_el_sindrome_de_asperger.pdfIn PDF document text
    • http://lojosikol.epizy.com/51832970022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1646e61-c181-4aea-9d92-edcd0181e87f/the_dhandho_investor_book_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3abda8-3f52-40a4-b2d4-51ef7d1d42bc/dyson_dc23_motorhead_not_working.pdfIn PDF document text
    • http://ruzuzis.rf.gd/kagigededaxojopagosot.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_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 5388 bytes
SHA-256: a13344a86468d9dde52bfe2f34dbb1ef234e07bb8bcb49ff8e771284c18c484c
font_01_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 10628 bytes
SHA-256: 647e596ec0d2d33ec6c74deb5e853149f08e362e3310358e35044626c59a19c1