Malicious PDF — malware analysis report

Static analysis result for SHA-256 273ce59b3fa5d990…

MALICIOUS

PDF

75.5 KB Created: 2021-03-19 18:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 172c74dc5a19e150d9c37ed8e498c41a SHA-1: ee11564bcc7a89c9274423e98cedeecf9d229053 SHA-256: 273ce59b3fa5d990c27670e09fc19d98efceae7993f7f8430362e899bf14ed4c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://bologen.ru/strik?utm_term=whitfield+pellet+stove+parts+list PDF link annotation
    • https://sobopagep.weebly.com/uploads/1/3/0/8/130873740/xavuxurojiraberewoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_600f0271d0f4b.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/fEdjhrF/command_and_conquer_red_alert_4_system_requirements.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5fff22a660bcb.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/acjhqhe/missile_commander_tony_temple.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fdf7949be8b5.pdfIn PDF document text
    • https://pusenosate.weebly.com/uploads/1/3/5/3/135347115/segiwotinuburo.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/e3b098ab-1c70-4d58-b714-287e16e46098/42976412883.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/azar_pro_apk_2019.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_559474d8f613477596a56426cbea7035.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_00c5be37d61c4caf9f61c2658e882d9c.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_4f054b84d4cd4a8e97eb7023ff561fc4.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_2cb7b14f7e314bb5a87ca3635cb6f23d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f57c860-fa95-459a-a249-0ac720be167f/gunidebatokefosutexo.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/does_lowes_sell_greenworks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65d2f74-64ae-4852-9c52-3c87e3a4e0fd/android_app_development_course_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5cd96c-4b79-4d4a-b5e6-8adc02da87ae/webasaruwapuzuzitoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a173f85-39a4-430f-aa45-06eed33a1506/how_to_store_frequency_on_baofeng_uv-5r.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_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 5200 bytes
SHA-256: 2908fa5fd42a484314a6e598d6122b1f8a57be25af60a616656ee55585880ad4
font_01_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 11016 bytes
SHA-256: 85fc8b4f5153a45dd63d891738a4610274f08bd6dd863a9486e4eebdd4fc8283