Malicious PDF — malware analysis report

Static analysis result for SHA-256 3def65e2f6596991…

MALICIOUS

PDF

75.8 KB Created: 2021-02-26 17:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 05d35adeed843e9d18502fa9b34d1b56 SHA-1: 8b05d61836171facab2951472c8eadf784c1aad2 SHA-256: 3def65e2f65969918cfde921724e1fbb8d2eec5419bcd74311ee6393cf8b5bdf
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, including 'fokemale.ru' and 'heliusdesign.ru'. The document body contains garbled text and metadata related to 'wkhtmltopdf', suggesting it was programmatically generated to obscure its malicious intent.

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://fokemale.ru/123?utm_term=how+to+check+obd1+codes+with+paperclip+honda PDF link annotation
    • http://heliusdesign.ru/canva_logo_mod_apktiv3v.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/hiihNif/prince_dress_up.pdfIn PDF document text
    • http://faketikus.22web.org/tamilrockers_2019_tamil_dubbed_telugu_movies.pdfIn PDF document text
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/5114516.pdfIn PDF document text
    • http://art-practice.org/auld_lang_syne_piano_chords_for_beginnersm1ccc.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/gfTHKgf/death_moto_4_apk.pdfIn PDF document text
    • http://leree6.club/uh_60m_flight_line_supplement4dytf.pdfIn PDF document text
    • http://dopenukivo.22web.org/big_buddy_propane_heater_manual.pdfIn PDF document text
    • http://storezone.info/xogevagofemelufifajizaegj8q.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/2eef9d98.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/mivokozibu/netbeans_for_mac_os_sierra.pdfIn PDF document text
    • http://toduwez.epizy.com/jabawibofidoxeloro.pdfIn PDF document text
    • http://wedofisirix.epizy.com/cessna_172_annual_maintenance_costs.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/tabla_de_densidades_de_los_materiales_mas_comunes.pdfIn PDF document text
    • http://gejaxogepokotow.rf.gd/wifiporukis.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/60828899665.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_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 5472 bytes
SHA-256: 2dee3b7d9cca42bd490970ea5e5a47f30bdfb3e6591013c72821192ffa6a9d76
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10820 bytes
SHA-256: 7ff72c9d7ccdb8e0a3fda782d63df69048d0c9e3953430802d940600c0c7e85d

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