Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ec00232f1e097b…

MALICIOUS

PDF

75.2 KB Created: 2021-03-23 11:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5e7aeb6b1e075437917ae8d80f48293f SHA-1: 0ea93b47b916faf490053f75a8879b6cc857a7a6 SHA-256: f5ec00232f1e097b0f7634f43112bcde71943aff65fbe4e11621b89e7de2928b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ML classifier strongly indicates maliciousness. The primary purpose appears to be directing users to a multitude of external PDF files, potentially for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://leonvi.ru/strik?utm_term=alla+prima+oil+painting+richard+schmid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391037/normal_6025e01f4777f.pdfIn PDF document text
    • http://shop50off.info/8615406500ynmp4.pdfIn PDF document text
    • http://7gusevshop.website/xumelazomocio5n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_601a6a4bab180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_604d6a89130d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_6013f46c34415.pdfIn PDF document text
    • http://titoto.xyz/how_do_you_troubleshoot_home_thermostatpa508.pdfIn PDF document text
    • http://winoraama.site/how_to_trade_options_on_robinhood_websited23kg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_6031508a4471d.pdfIn PDF document text
    • http://afracheat8.xyz/riverdale_comics2gqp4.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/6eeb59ce-f4e6-45fd-b8be-a80dd59aa524/animation_apps_free_for_android.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_7c30d03c57a4418fa568037ddbf780a1.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_65492f98d48044659f66d3d192717b2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21fcd34-a7e1-44a8-9bf5-4c693c397a66/work_energy_and_power_practice_problems_answers.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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 5476 bytes
SHA-256: 75111fb7742424c524ce2c31af3e0cb08d76ef68789bd152817e0c137b5232c7
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 12476 bytes
SHA-256: 4c6c20112ba34b105bba503bb622e8ee22f363fa0a20352170ab6f5a43532ca7

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