Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fb8c0ece7f4548…

MALICIOUS

PDF

178.2 KB Created: 2021-04-22 10:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8f220d7382a21e01d66a9551fab10e25 SHA-1: 0a4c54077abd327bf943b34ff0e42caa01657c99 SHA-256: 95fb8c0ece7f4548e15413a3bfb0d50f81a8b8f179d20bd9629b3ffcf7050f01
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=el+arte+de+la+guerra+capitulo+3+analisis PDF link annotation
    • http://zuzutefiro.22web.org/2005_cadillac_cts_for_sale.pdfIn PDF document text
    • https://worudunomazife.weebly.com/uploads/1/3/1/4/131483266/6619c08299e35e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5feb45689f7a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379601/normal_5fcd1089d5c51.pdfIn PDF document text
    • https://gudesikoz.weebly.com/uploads/1/3/4/3/134374550/1758619.pdfIn PDF document text
    • https://sawanizoso.weebly.com/uploads/1/3/4/6/134654845/joguzinomazoruli.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/12390834863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fc88b6b3c62a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dorediludopa.epizy.com/24596682198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa75b1d-9542-4110-bb64-2e51a4d80050/stairway_to_heaven_tab_by_led_zeppelin__ultimate-guitar.com.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/cyber_security_certifications_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560a6eea-30aa-4bb3-9998-4afc13e8d7bb/best_treatment_for_gypsy_moth_caterpillar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fca3e0c-84f9-4439-8bca-a25e4728212d/pathfinder_kingmaker_beneath_the_stolen_lands_main_campaign.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/39837686773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3b54f9-35b4-45d5-8841-4cabc08ed492/39303292099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fcaaf76-7b0b-40dd-85bd-3cffb68c83ad/epson_workforce_wf-2630_treiber_download_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f19cccf-72a1-41ac-8dea-a395220fa34d/72430611399.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_off000279e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x279E0 5360 bytes
SHA-256: 3a6d3747aa7752ba885edc2e481ad09769b0b4bd665f70032af8d98cbd9fde1f
font_01_sfnt_off00028c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C2F 14304 bytes
SHA-256: c72959f18f5c21b7ac5a16309dd695b27b30a17b403e6d60d9fc79f357b7fc13

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