Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9352afc40d0901a…

MALICIOUS

PDF

79.8 KB Created: 2021-04-28 01:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a678848bbe0d507a171b20cdbf1ad5cb SHA-1: 5b4d82fec4d8fb29a908925fe357f0a6c4d441fb SHA-256: c9352afc40d0901aa45011be5c4ff9b121c32a93cadb6880c8351cdd0d222f2b
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 0.9993

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://gimoguvi.ru/strik?utm_term=bodas+de+sangre+summary+in+spanish PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4394061/normal_5fe0c193dc8d5.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://kewokuxumuzig.medianewsonline.com/workout_at_home_without_equipment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_6048235eb0b93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_600e23a20f8e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_60596680b9a1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5fe9d090722ef.pdfIn PDF document text
    • http://yandex-dostav.ru/428499393221nfl0.pdfIn PDF document text
    • http://fomamiforepu.22web.org/free_printable_5th_grade_division_worksheets.pdfIn PDF document text
    • http://reduslim-europa.site/475501440675phf3.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/how_many_carbs_in_arbys_sweet_potato_waffle_fries.pdfIn PDF document text
    • http://fakadod.iblogger.org/rockefeller_street_piano_sheet_music_easy.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/military_alphabet_code.pdfIn PDF document text
    • http://prizinsta24.space/livosikovaxavh0jl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_f0f1149270ac4ce1ad6cf88fb8397e0e.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_84a2082a4c6e49489a8b024c6d5f151b.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_77a8526b47fd467284b96aade87d53ba.pdf?index=trueIn PDF document text
    • http://padegijogul.atwebpages.com/52993772063.pdfIn PDF document text
    • http://fukevitadej.epizy.com/types_of_authentic_assessment.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_a540035b96044c63b3e14eb54b6470d8.pdf?index=trueIn PDF document text
    • http://taxifegizuni.epizy.com/examiners_report_acca_p5.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_5687fe3ffc564990a5e4fa480d28b4a1.pdf?index=trueIn PDF document text
    • http://weparaxopulo.atwebpages.com/oscar_et_la_dame_rose_sparknotes.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_7400b83ac71c43b6b5e5768dc8a2b3f9.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_6fca3f966e09482ea210dcc7ee1011a5.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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 5492 bytes
SHA-256: 29ddc4379ee78281e0caa33de0641487f7806c4d13b9558c7ab46eb2a7354a96
font_01_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 11252 bytes
SHA-256: bd55b0b31c4a1902994cca0e90b057ffabf47a3453d2b7e49c6edb97cfaaecca