Malicious PDF — malware analysis report

Static analysis result for SHA-256 37eb9c395f856f2a…

MALICIOUS

PDF

71.9 KB Created: 2021-02-23 16:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f409b9a772a6fbf09ae677e575b17075 SHA-1: a525d30e8e3627c310f37fbd735da17154a19f8b SHA-256: 37eb9c395f856f2abda3a2253f6e4ef970cfbb9d7a1749077084330a9df1f278
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically appearing as a search result for 'how to draw caricature in photoshop', suggesting a lure to a potentially malicious website. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating the PDF is part of a link farm on disposable hosting.

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/wb?keyword=how%20to%20draw%20caricature%20in%20photoshop PDF link annotation
    • http://dvigatel.guru/notojimotemeivsyh.pdfIn PDF document text
    • http://migerov.xyz/fowavemekonipavigimidyfla.pdfIn PDF document text
    • http://tehnikator.ru/augusto_cury_o_semeador_de_ideias9k6vf.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/ihcJicH/download_stickman_dismounting_4_mod_apk.pdfIn PDF document text
    • http://saxumoru.iblogger.org/82891907978.pdfIn PDF document text
    • http://euroshopme.site/an_american_childhood_summary_part_12q4rc.pdfIn PDF document text
    • http://sfr-webmail.com/38981701260zc9zb.pdfIn PDF document text
    • http://efarbok.xyz/pipedizijdwc.pdfIn PDF document text
    • https://cdn.sqhk.co/mirusopujame/ahjje5E/history_channel_alone_season_7.pdfIn PDF document text
    • http://frontglass.xyz/gejirisosal0id0m.pdfIn PDF document text
    • https://cdn.sqhk.co/wiluxuko/igijdtb/rotod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sovizurimi.rf.gd/49495361494.pdfIn PDF document text
    • http://suwapazuxesara.epizy.com/manualidades_faciles_con_carton_y_papel.pdfIn PDF document text
    • http://dekutob.epizy.com/package_tracking_log_template.pdfIn PDF document text
    • http://fanurumuge.epizy.com/behringer_deepmind_12d_user_manual.pdfIn PDF document text
    • http://memugeb.rf.gd/pakufadunesumilowiv.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_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 5184 bytes
SHA-256: 8798bf966c3b2ff36c67abcc569467aa0953955403542c757b81ad718f88db2e
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10088 bytes
SHA-256: fb4f595197242b4cdd7bd5d8a8d32e9d54a8a4f7ecf5614de6630ee20d50b019

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