Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee45aa71ad5f980…

MALICIOUS

PDF

79.4 KB Created: 2021-01-26 12:52:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5a43fd3faeca020e4d04f6ee6d6c3e29 SHA-1: 544f7cbd48f8fb69b613b8e30f517963a5314b1e SHA-256: 6ee45aa71ad5f980188b0d1817b35c5dc665597b6a9600a457e2bbdae0ce41ea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=the+great+gama+wrestler PDF link annotation
    • http://reduslim-italia.website/usanetwork_activate_nbc_fire_tvd5sdk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5ff9287eccd64.pdfIn PDF document text
    • https://cdn.sqhk.co/xamubana/6VUgcwW/coin_master_free_spins_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/zubixola/UiBEbZJ/gun_firing_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/Lhb5jc6/55385801719.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/ZeQiige/switzerland_official_language_map.pdfIn PDF document text
    • http://koolmaxt.online/76874890514yc9vj.pdfIn PDF document text
    • https://cdn.sqhk.co/momebuman/pigWjcd/world_war_2_books_fiction.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5fe3b19b48130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_600bc3fac0307.pdfIn PDF document text
    • http://everydays.space/super_adventure_pals_2_online_game9h7yg.pdfIn PDF document text
    • https://cdn.sqhk.co/serojimo/yIpK0hb/19904402679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5fcd50f249d9a.pdfIn PDF document text
    • http://autolombardpro.ru/pickup_truck_icon_pngd4526.pdfIn PDF document text
    • https://waboralitenir.weebly.com/uploads/1/3/4/5/134504299/2040472.pdfIn PDF document text
    • https://wibejimexog.weebly.com/uploads/1/3/4/4/134466339/bazifipotuma.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/jbCGghl/posemugobusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kakef/colorado_river_fishing_report_austin_texas.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_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 5140 bytes
SHA-256: eb1a765d1cf694182741bf3fc7f852f3ee954ce7cb63cef8c9a926ba221c62f5
font_01_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 11404 bytes
SHA-256: 003633d1fbb34814cde20e917d5dcc35b87b2aa5d7c9103d89709362e7ba8ad6

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