Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c22bcf65f6f785…

MALICIOUS

PDF

73.1 KB Created: 2021-02-28 21:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 4d2fc25eafb6ce4893b47d1f55884b70 SHA-1: 40f5b79f01dc888f6fc11a1d2718cb586d8051af SHA-256: d3c22bcf65f6f7858ba2147975da1698978ef08351524cb7aad9d9c8077134b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body itself is heavily obfuscated and appears to be junk data, reinforcing that the primary malicious function is the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=consecutive+integer+word+problems+worksheets+with+answers+pdf+kuta PDF link annotation
    • http://kujunat.medianewsonline.com/how_to_clean_a_black_and_decker_dustbuster.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/eRjjifn/melody_ehsani_reebok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416938/normal_60063f9ae8ffc.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/12074896305.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_long_to_see_results_from_5_2_diet.pdfIn PDF document text
    • http://rumagadoli.22web.org/36327344126.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/jigwz7I/world_conqueror_3_ww2_strategy_games.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/minecraft_free_pc_1._14._3.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/Jpvhggd/jutusukatokilezowizipuz.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/sgcgfjb/fumewogapujulasilesiton.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://felakaselik.epizy.com/80316915888.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/chhota_bheem_video_song_pagalworld.pdfIn PDF document text
    • http://podixevobelataw.rf.gd/jozipilow.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_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 5832 bytes
SHA-256: a724c426462bcbbdfec6c7c2e2f240338595e5156b29696c52927b6b9342d4de
font_01_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 10192 bytes
SHA-256: 3a260061885239b0ef7c00f8f3d09d637bddeda21b52787b54ef38053a223f90

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