Malicious PDF — malware analysis report

Static analysis result for SHA-256 011de084df300d78…

MALICIOUS

PDF

69.9 KB Created: 2021-03-16 03:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe586b8a4d0f74b8e705406133cf3396 SHA-1: e5a69d5d3c175d218943773b84543a3ce57ebdcd SHA-256: 011de084df300d78485daa993e9826f58dd3cc55b85216029d6dfc84cbaf6ef9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. One of the primary external links is to 'https://botokaw.ru/strik', which is likely part of a phishing or malware distribution chain. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=doing+philosophy+5th+edition+chapter+1
    • https://sizofepetawun.weebly.com/uploads/1/3/6/0/136087679/milutuk.pdf
    • https://zidesefaw.weebly.com/uploads/1/3/2/6/132680856/397398.pdf
    • https://cdn.sqhk.co/dijabidasu/aVgdhfJ/rock_of_destruction_max_level.pdf
    • https://rasogumelix.weebly.com/uploads/1/3/5/4/135400304/f03e522.pdf
    • https://cdn.sqhk.co/rojarimeg/aigjaha/sniper_rifles_bolt_action.pdf
    • https://cdn.sqhk.co/vogoxaginoje/fxgc83L/55024578393.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tosevud/pre_algebra_math.pdf
    • https://uploads.strikinglycdn.com/files/18c0585f-2f23-4120-b7c7-3925ed8469e8/25535753856.pdf
    • https://uploads.strikinglycdn.com/files/2b8ab7ba-6c5e-4f42-84fb-ef294b7651b7/11269108945.pdf
    • https://uploads.strikinglycdn.com/files/36386dbe-0b01-4ad8-bdad-99783d786450/bulovugakap.pdf
    • https://uploads.strikinglycdn.com/files/4ee635dd-f747-480e-b433-2d80d996b8b9/xivezeri.pdf
    • https://uploads.strikinglycdn.com/files/8364774a-abe1-486a-afea-34244c37427b/93534271835.pdf
    • https://uploads.strikinglycdn.com/files/d193fbaf-dd38-4630-a567-f72395c914b9/different_chart_patterns_in_technical_analysis.pdf
    • https://uploads.strikinglycdn.com/files/2e669849-a644-4512-b772-b208cfac21f3/riwej.pdf
    • https://s3.amazonaws.com/fejenijovekozu/easy_recipes_for_beginners_for_dinner.pdf
    • https://s3.amazonaws.com/xubifupi/65186592727.pdf
    • https://uploads.strikinglycdn.com/files/32f7f001-5bd8-456b-8dc0-d6a9833ec6ae/32405735142.pdf
    • https://s3.amazonaws.com/xulepiwa/96197310647.pdf
    • https://uploads.strikinglycdn.com/files/311ddef1-badc-44c7-8aab-7763565a9856/bawizusutubi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d488.bin
d43067c178c152b4bad779820c9085ea0f9a15d7dfe7ea8181ae07085b4c40e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD488 5612 bytes
font_01_sfnt_off0000e7b2.bin
63d3a7b75cedab10cc0969b62761889b7377db70061994301f64929122524353		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 10172 bytes

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