Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9fef7536836d93…

MALICIOUS

PDF

73.8 KB Created: 2021-02-25 18:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6564eccaeb4497d3b254f0ec0424a257 SHA-1: ff7e108e13ceef3cbc921ecd6f32b07813581380 SHA-256: 4b9fef7536836d93250a57ef6a22bb405da5149128c1a5f794c296d23361b039
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain (jottigo.ru) that is likely used to redirect users to malicious content. The presence of external URIs and link farm heuristics suggests an attempt to drive traffic to potentially harmful sites.

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://jottigo.ru/123?utm_term=life%2527s+little+instruction+book+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/wusakituzu/jaexgdy/heartstart_training_bronx.pdfIn PDF document text
    • http://rokexulom.22web.org/whatsapp_plus_6._76_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_603255f207a49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fc932bd2a8d0.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/jijbVkj/download_doodle_magic_joy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_602a728d66a1f.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/kinebisofav.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/4HTjagm/start_my_own_kingdom_bannerlord.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/igjaiea/39503255917.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/xhgijjd/2619359049.pdfIn PDF document text
    • http://vuvowepo.22web.org/angular_datepipe_transform.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5ff453d31b070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawabubobiniz.rf.gd/bahubali_2_tamil_video_songs_720p.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/metodologia_de_la_investigacion_cuantitativa_segun_autores.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/roomba_battery_reset_procedure.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_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 5540 bytes
SHA-256: 4b31f439e3ef426502d555ca877c61f0b0c8b1dd9dba68ef8693c2d9ab6703e1
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 11268 bytes
SHA-256: d96721252097d68c5615291be85b6a12ca0c28129fcdb7c0479113d04639a0aa

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