Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2201edd83d9a64…

MALICIOUS

PDF

79.5 KB Created: 2021-05-30 07:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9534cc8b84fe034d05e4355b86f3aee2 SHA-1: 5458e30c3a0f4ccad5f841807975982305b31a07 SHA-256: 7d2201edd83d9a6424de329a7c9be57de289a0378954d807a899f0dc2681a14c
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, with one prominent URL pointing to a suspicious domain, suggesting a link farm or phishing attempt. The PDF's structure and content, including embedded URLs, indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=libro+curso+completo+de+guitarra+clasica+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365589/normal_600abd5bd47db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5fd26ecf94eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_602d37c81f3f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_60418e8ec1088.pdfIn PDF document text
    • https://sekuruzinof.weebly.com/uploads/1/3/4/8/134897543/9395301.pdfIn PDF document text
    • https://gedikitol.weebly.com/uploads/1/3/4/9/134901051/3bb8207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_603b5243e4aab.pdfIn PDF document text
    • https://xikigojajutu.weebly.com/uploads/1/3/4/3/134385057/ferivakorut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_604c9f18eb48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_602e9bf34cf4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_60488eefc48b0.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/d2f02543-e262-48b5-a701-559bcaba99c3/bissell_big_green_professional_carpet_cleaner_machine_86t3_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d863a4-887e-4fef-bccd-da9983724a4d/83497178014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630fdb2a-f415-4342-90a2-96c2a6034e44/team_xtreme_titan_launcher_download_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30154dca-ead9-4b1d-a80e-1ca2cdedd690/suzuki_sidekick_4_door_4x4_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd7806c9-5ad8-4d50-ba3c-aa6d054145dc/raymond_murphy_english_grammar_in_use_for_intermediate_learners_fourth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde6b05c-dba2-4ccf-b5c2-fd7c70d2a035/vodavirijasusevaroj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6090ac99-dea8-4337-a780-4d77d0a63b36/vudak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11c44ef-a5cd-4f87-9f3c-09ad0b74fe1e/probability_word_problems_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c96fc1-6f78-45fa-bc64-43b2f05c9f75/adding_and_subtracting_mixed_fractions_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/504d2c61-b84b-4d9a-ba51-c9ca37de9638/beauty_lies_in_the_eyes_of_the_beholder_meaning_in_kannada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3bf8d9-709a-41dd-a6de-698ce00e42e8/funagefikunopevasi.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_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 5556 bytes
SHA-256: b3ce25970669919c7a46de063ef4d3e5ead22eda2e799656ab836f100b3edac8
font_01_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 11912 bytes
SHA-256: 6d54e8dec2afa6f784b82a859e23a840b8ff86dcfa5b5d12dc8a8f889a468381