Malicious PDF — malware analysis report

Static analysis result for SHA-256 873283c290a7a0d9…

MALICIOUS

PDF

76.5 KB Created: 2021-03-17 13:25:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7b8058cf2b165bec85dd85ecb1fb6baf SHA-1: f8360071e46820d0ca68728d392b53572d362614 SHA-256: 873283c290a7a0d94904c17b31311e2ed266b0e2e6207621fc571c8f603a9ccf
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable one pointing to 'vilenefex.ru', suggesting it functions as a link farm or phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristic firings strongly suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://vilenefex.ru/strik?utm_term=daughter+of+smoke+and+bone+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fe6d5588b496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_60290c966c72a.pdfIn PDF document text
    • http://gta-msk.ru/bizilifedogurigojuzitcj1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464863/normal_602945af3a79c.pdfIn PDF document text
    • http://sibamonowoli.22web.org/62257165622.pdfIn PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/5377611.pdfIn PDF document text
    • http://nonly.xyz/ada_guidelines_for_infection_control_2018wcvdr.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/bikenedotaxeta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonopexurobuma.epizy.com/25946541096.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_46361f5e0a6f41619f78439c619c631c.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_51ffc9302db34a37b41cc5bb9faa3d27.pdf?index=trueIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_5bdef3532e694f0b8bd42569825ff56e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ccaeb7-54b9-4431-8612-ee127eb7c8ef/how_to_write_a_geometric_series_in_summation_notation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbef7523-84c6-4136-979c-068a221b8d69/ariens_rocket_tiller_7hp.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_eaf06fd3fe834638883662cef69d23e9.pdf?index=trueIn PDF document text
    • http://fururebinupi.epizy.com/how_to_use_the_dremel_3000.pdfIn PDF document text
    • http://tibofova.epizy.com/raving_fans_ken_blanchard_free_download.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_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 5492 bytes
SHA-256: 0e6efab6c3649c5a723a6e5c499ced7dff0d0763b0a1922638754cb25f235e5d
font_01_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 10628 bytes
SHA-256: 0383614f068a5d3adb35eb674611665c3b5bd6c200f6209ef8e5bc8c795bf829

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