Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bda8c858e4e97a…

MALICIOUS

PDF

79.8 KB Created: 2021-03-19 19:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fb3000a4f7eec1fd052b47846aaa1bc SHA-1: d74c5c3536c775e47cfcce6db3a8228478a024eb SHA-256: 89bda8c858e4e97ab80b8a8ff50a399bd9e08cdb4eac26a696322c967a7a41b2
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, including one that appears to be a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute content across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/aws?utm_term=element+roku+tv+40+inch+costco
    • http://nonowun.mywebcommunity.org/how_to_remove_bonaire_evaporative_cooler_pads.pdf
    • https://cdn-cms.f-static.net/uploads/4445570/normal_604b85405bd3f.pdf
    • http://gixodugesu.medianewsonline.com/aice_general_paper_textbook.pdf
    • https://cdn.sqhk.co/pixefavenar/jbhcAea/51952012185.pdf
    • https://cdn.sqhk.co/lukedivibeb/U5eghnq/chess_game_free_download_for_desktop.pdf
    • https://cdn.sqhk.co/fetebutujo/YehaidK/mindtap_aplia_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4467975/normal_6008b4a056e19.pdf
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fd61d1eeaf97.pdf
    • https://cdn-cms.f-static.net/uploads/4453134/normal_6038914156f66.pdf
    • https://static.s123-cdn-static.com/uploads/4389586/normal_600776c390031.pdf
    • https://cdn-cms.f-static.net/uploads/4459791/normal_602310c72b645.pdf
    • http://pimadukemaxi.22web.org/vufoxaganoxaripebaraga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kexijilavagela.rf.gd/tipenunuxurusaza.pdf
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_fba01975751d4438a457d6794c15d7bb.pdf?index=true
    • http://lojupodinitaxug.epizy.com/zokozefinovebamizut.pdf
    • http://janarisugikev.rf.gd/26208205182.pdf
    • http://vimixof.onlinewebshop.net/astral_pvc_pipes_catalogue.pdf
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_79fee3d12cd94232b4e297162c2b7337.pdf?index=true
    • https://4c59abce-f8c7-4907-88ef-1df00ddd7b79.filesusr.com/ugd/e54fc7_0f34d28980184430bac25f8c54ab9ab6.pdf?index=true
    • http://likijanima.epizy.com/bijazej.pdf
    • http://davinawoguzag.atwebpages.com/dijovuwifesa.pdf
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_8e1cf42ee5274630a7abc38febb91b8b.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_off0000f6f4.bin
14ca6e45738b3c2846066951e180eef622b9b4134cb2f93b45798a91ff5abe41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 5140 bytes
font_01_sfnt_off00010859.bin
ab5bf85080aa110fff8f6fdee3dcdb8ce57508bbd3e5a89f2ff37241b02bb30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 11696 bytes

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