Malicious PDF — malware analysis report

Static analysis result for SHA-256 1393589cfe42d304…

MALICIOUS

PDF

76.6 KB Created: 2021-02-18 02:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2c8edd48102af930436dff7feb378075 SHA-1: e78f5d9ebd44bf55e75b650ae485cf6942738214 SHA-256: 1393589cfe42d304a3f51a83af7cd4705a09245b916da3ca36a9333b4a5e806e
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=karcher+pressure+washer+3000+psi+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485016/normal_5fe0b0ac17b1a.pdfIn PDF document text
    • http://mihetos.xyz/638838889580fquw.pdfIn PDF document text
    • https://cdn.sqhk.co/pipidopowewe/lDhihdM/xeseboxelif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_6000a6e80a2b9.pdfIn PDF document text
    • http://znalomstvavip.site/university_calculus_early_transcendentals_4th_edition8n6q1.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/LDjgI3n/printable_caregiver_daily_checklist_template.pdfIn PDF document text
    • http://salebox.shop/dragon_age_origins_alistair_conversation_guidekscoa.pdfIn PDF document text
    • http://craftsmansmetics.com/arcade1up_golden_tee_pcbbxp0q.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/Djdjft0/idle_air_control_valve_replacement_cost_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/WibRiab/coffin_dance_meme_mashup_roblox_id.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5fe6a23b209d6.pdfIn PDF document text
    • http://1xbet-football.fun/best_rock_songs_about_losing_a_loved_onegmbp3.pdfIn PDF document text
    • https://cdn.sqhk.co/gugosobor/hjjfmgj/5._11_tactical_pants_fire_navy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 5356 bytes
SHA-256: 7fb6ea67f840cc4123c6603b1ae06cd8a1f5879869180f4bda4e613b04acc58d
font_01_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 11420 bytes
SHA-256: ee32fc269b6ccaf04e37452ef0f0766a6d8ca319afe1475f2c861cbeb3b0b3a1