Malicious PDF — malware analysis report

Static analysis result for SHA-256 c066d3b56a861fe6…

MALICIOUS

PDF

74.1 KB Created: 2021-03-08 18:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c5efd886ee4891d96761c6e8049b74 SHA-1: db3c6c8ee9d5af7fb44f27fda5943b2a2465f95c SHA-256: c066d3b56a861fe6ecbd0ce58e249c90e1a9448d4ad5f62a6cfff688f621079b
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains embedded URLs, one of which, 'https://jacksth.ru/strik?utm_term=modernist+cuisine+at+home+pdf+espa%25C3%25B1ol', is flagged as an external URI and likely serves as a lure. The PDF also functions as a link farm, directing users to various domains, some of which are hosted on disposable infrastructure, indicating a phishing or malware distribution attempt.

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://jacksth.ru/strik?utm_term=modernist+cuisine+at+home+pdf+espa%25C3%25B1ol
    • http://jedomagisuw.getenjoyment.net/27505822441.pdf
    • http://tijudozi.scienceontheweb.net/35870348693.pdf
    • http://dotekebenutedex.scienceontheweb.net/31139602260.pdf
    • http://gnatural.space/971252381010iiwp.pdf
    • http://vovality.club/gegupetumaxogoluxatita6ov3c.pdf
    • http://jakusavu.sportsontheweb.net/bevobizokubose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xemigososefof.atwebpages.com/they_say_i_say_4th_edition_free.pdf
    • http://bixozebaxikapos.atwebpages.com/analog_and_digital_signals_and_systems.pdf
    • http://xomapagovujux.atwebpages.com/how_do_i_find_the_model_of_my_singer_sewing_machine.pdf
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_bc3b9bce11aa48f4bad3efcb8626a906.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f963e2c6-66f9-4976-a493-7022f1249d51/does_planet_fitness_do_first_responder_discounts.pdf
    • https://uploads.strikinglycdn.com/files/f93b95cf-4ffc-47b8-be92-11d21e91af75/download_m-audio_fast_track_pro_drivers_for_mac.pdf
    • http://miwewugewu.atwebpages.com/67906595694.pdf
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_b64a21fe58134883b6f25f830303c5c6.pdf?index=true
    • 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_off0000e17b.bin
02032f6400bc8b8f4262bde3a13ae83f26f4b559067741215c9db833955af978		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 5612 bytes
font_01_sfnt_off0000f433.bin
34c5cde6abb701fc5b7d3a49bd90c6b605213430a0bb2aee4e083fa071e173e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 11044 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.