Malicious PDF — malware analysis report

Static analysis result for SHA-256 5894982cf95313f3…

MALICIOUS

PDF

71.7 KB Created: 2021-06-13 23:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2383f6b60f09827363198f82ec14c305 SHA-1: f403d19ab809f62e33fec168ee6800bf4e2a7420 SHA-256: 5894982cf95313f32e2e6dca22e8d2ba5bc19b0ef9d5f665d6a0643ff89eb311
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs, including one pointing to 'nomylo.ru', suggesting it is part of a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to game titles, indicating a lure for users seeking downloads. No scripts were extracted, but the presence of multiple external links and the ML classification strongly suggest 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://nomylo.ru/pbw?utm_term=apunkagames+tekken+5
    • https://static.s123-cdn-static.com/uploads/4470540/normal_60082042b912b.pdf
    • https://kuvovoturuja.weebly.com/uploads/1/3/5/3/135322548/4375846.pdf
    • https://lezisonesu.weebly.com/uploads/1/3/5/3/135339892/cd5e0138d8fa07.pdf
    • https://nopiviwefimak.weebly.com/uploads/1/3/4/7/134708781/6394883.pdf
    • https://static.s123-cdn-static.com/uploads/4484990/normal_5fc860a01b544.pdf
    • https://juziwujaxizeze.weebly.com/uploads/1/3/4/6/134685910/bidedebidovin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lekuzax.pbworks.com/f/gelebonegulufowatuwaf.pdf
    • http://nosegawibaso.pbworks.com/f/kai_po_che_shubhaarambh_mp3_download_320kbps.pdf
    • http://zanonot.pbworks.com/f/full_quran_in_roman_english_free_download.pdf
    • http://visetululiv.pbworks.com/f/operations_management_sustainability_and_supply_chain_management.pdf
    • http://ranetowunose.pbworks.com/w/file/fetch/144834528/how_to_reset_singtel_voicemail_password.pdf
    • https://uploads.strikinglycdn.com/files/72dfc6e3-3200-4c5d-b09f-9a8633c7101d/gamosanotepovelojodanu.pdf
    • http://tipewizu.pbworks.com/f/study_to_shew_thyself_approved_unto_god.pdf
    • http://wiwedano.pbworks.com/f/11677720012.pdf
    • http://buluwogot.pbworks.com/w/file/fetch/144841191/latihan_soal_tes_potensi_akademik_s2.pdf
    • http://volikedejefa.pbworks.com/w/file/fetch/144653949/sojovogizodava.pdf
    • http://puxivir.pbworks.com/w/file/fetch/144741726/kisuduxisepexeguxujoje.pdf
    • https://uploads.strikinglycdn.com/files/4e2d40e7-6ffe-46ad-b5c5-b9f1d55604bc/thus_spoke_zarathustra_kaufmann_epub.pdf
    • http://pesivop.pbworks.com/f/mixed_reported_speech_exercises.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_off0000dbe1.bin
b90ed247e315ddc0a7cb817a2c68f22514c1c8ec60f873ea873fe3204debd0f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 5188 bytes
font_01_sfnt_off0000ed85.bin
21aff170727d9a898b59d7628d912874c560f67de34ab2f0fa824361d1e7f559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 10204 bytes

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