Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c59dd1db47b838…

MALICIOUS

PDF

97.6 KB Created: 2021-03-07 22:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c4f8bcd0dba3ff5f09e69eaf056221aa SHA-1: 11461ff0e5ad94a346718c453b7772d89a0407f0 SHA-256: 86c59dd1db47b838418440e602e71a18ca775d5a8d5b39fbf9222b785178e1e5
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 0.9999

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 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/wix?keyword=que+es+un+protocolo+de+investigacion+ejemplo PDF link annotation
    • http://ryduslim.website/victoria_secret_show_performers_2016uxfet.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/BusTZgf/battle_warship_naval_empire_gift_codes_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/tmifoOs/paypal_customer_service_hours_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/pl9z1jb/ruvutejazan.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/ihYiggc/idle_defense_dark_forest.pdfIn PDF document text
    • http://vinnipoh.space/nasal_cavity_function_in_respiratory_systemxi9fx.pdfIn PDF document text
    • http://aicberg.net/20938645111ebax8.pdfIn PDF document text
    • http://nicepics.xyz/lepizafovabojupaxixitijtjt6e.pdfIn PDF document text
    • http://zubiki.top/kekoza9pgvg.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/kacheri_aarambam_songs_mp4sxvms.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/kugelexazuwugazijutinutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fcd74afec4f9.pdfIn PDF document text
    • http://hairsprof.ru/eb_white_once_more_to_the_lake_purpose9o2ao.pdfIn PDF document text
    • http://tonilakifak.mypressonline.com/swtor_update_6.3.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/GigTdNQ/switchme_multiple_accounts_apk_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_601cf94b2e1cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fulazelof/43638191617.pdfIn PDF document text
    • http://dapibudajemuk.atwebpages.com/21907446016.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/dunkin_brands_annual_report.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_off00013c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 5588 bytes
SHA-256: c96c86cb9e514a5b88b20d11fa5c132172385687e1d4074a82b3d3cceb2a1f24
font_01_sfnt_off00014f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F23 12568 bytes
SHA-256: 1db7a8a0d5df46886e01c0b1b46a232e57fe910dd5e2576116a051876995faae