Malicious PDF — malware analysis report

Static analysis result for SHA-256 29772b4e31b69afb…

MALICIOUS

PDF

94.6 KB Created: 2021-05-27 23:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4dd64c10921afefeb35a0964e33c938c SHA-1: 57e4a2f9e7abb35b2460c40526cb8e6a30278e62 SHA-256: 29772b4e31b69afb2c8234c4925b561dfb07097114493b010fa84d08fe41a3e3
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly to domains like kuzutuzo.ru, suggests a phishing or link-farming scheme. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://kuzutuzo.ru/123?utm_term=ccdc+5b+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5fe4feb51a6c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5fddf465ab540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428033/normal_5ffd632599afe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384030/normal_5fcce02876d30.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/tupofirug.pdfIn PDF document text
    • https://gituruledutaza.weebly.com/uploads/1/3/4/4/134401886/7634726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_601bcc17bada7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_60164874a6972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5ff2369280ce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_601faa2dbf36e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366047/normal_6008eff78345e.pdfIn PDF document text
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/mixopoburo.pdfIn PDF document text
    • https://nibevomixosu.weebly.com/uploads/1/3/4/1/134108547/e12263ab9a.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/3bd06b50-ad90-41e0-9b17-f8de670320fa/gukop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdada9bf-1d3c-4c6f-9aab-f616dace8683/what_is_the_lucky_color_for_year_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73503cd4-fb61-4852-8036-df68bd629db2/guide_for_talking_tom_hero_dash_game_download_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a17a5ea-71d6-4c42-bef0-a1a04ec5a0d1/ingilizce_kelime_renme_program_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fad582-1191-41fe-944c-ca0e7cb4f1ca/wesifatizenefana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4235ee9-d616-4f85-9268-7329d3378b18/dell_latitude_e6410_laptop_displayport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45c1e5e-6ecf-4e36-8142-e3d6255b60f9/fegivuxagowuzesamu.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_off000136dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DD 4764 bytes
SHA-256: 716199a944c5964b07c15b08e06ae7bd561696ed398eeb3aaca96402f2e5de79
font_01_sfnt_off00014722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14722 11456 bytes
SHA-256: 662d820edbb6d511b06f96b4c1f8f8f5bf8fcaf0540891e6e4f689ec4e570c2d

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