Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56c3e2a364c72f0…

MALICIOUS

PDF

76.1 KB Created: 2021-06-13 21:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c0b2748657692b515901daa3d792f38 SHA-1: 69a4e6f8f57b225c47b65ecf5ab50bd9c3cb43ed SHA-256: b56c3e2a364c72f087c7537d01e62d04719fa7c628adc81e013abf19ae8fb1dc
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier with high confidence. It contains an external URI pointing to 'pistant.ru', which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded content suggest it's designed to exploit users by directing them to a malicious site.

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://pistant.ru/pbw?utm_term=mass+communication+theory+foundations+ferment+and+future+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/61d657b6-8250-4dc8-bb67-451a21aaffe3/how_do_you_fix_an_ionic_pro_air_purifier.pdf
    • https://uploads.strikinglycdn.com/files/a93a12f9-2f0d-4de4-8d0d-1cb0e6b73bcf/que_tipos_de_fichas_bibliograficas_existen.pdf
    • http://jesababa.pbworks.com/f/reading_comprehension_present_simple_and_continuous.pdf
    • https://uploads.strikinglycdn.com/files/61a7b16a-67b0-4352-b443-bada3bdce622/yamaha_timberwolf_250_carburetor_for_sale.pdf
    • http://misabovu.pbworks.com/w/file/fetch/145206543/nba_2k20_android_download_apk.pdf
    • http://zutaman.pbworks.com/w/file/fetch/144827844/gta_5_psp_rom_android.pdf
    • http://fesatisobif.pbworks.com/f/jozutagemojufulutiwafuxu.pdf
    • http://jutopar.pbworks.com/f/82146501496.pdf
    • http://jubujefaj.pbworks.com/f/rupekugez.pdf
    • http://zovafidat.pbworks.com/f/don_12th_english_guide.pdf
    • http://joriguzo.pbworks.com/w/file/fetch/145123728/dogokefi.pdf
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144714480/27649255009.pdf
    • http://tukosifana.pbworks.com/f/german_email_writing_examples.pdf
    • http://kuperuxowix.pbworks.com/w/file/fetch/144539553/bimitimomaj.pdf
    • http://vepexiritab.pbworks.com/f/mia_khalifa_diss_track_i_love_friday.pdf
    • http://dawijunegolo.pbworks.com/w/file/fetch/144576891/how_to_reprogram_a_compustar_remote_starter.pdf
    • http://vimadutukad.pbworks.com/f/63256971194.pdf
    • http://mefijunov.pbworks.com/w/file/fetch/144414783/real_book_bass_clef_free.pdf
    • http://padimagofo.pbworks.com/w/file/fetch/144477972/runipefunajomukus.pdf
    • http://mituxap.pbworks.com/f/guladigimox.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_off0000eb4e.bin
05369445f201db37e2d0f94aee4e35942906a35e4531f5ebe5aa42aff8e14fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 5472 bytes
font_01_sfnt_off0000fdd3.bin
63e18d7b62b0daba7acc24a3c31272fa81557ff447d9009610b9fd3e7bc87289		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 10944 bytes

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