Malicious PDF — malware analysis report

Static analysis result for SHA-256 4368391a37ece9fa…

MALICIOUS

PDF

72.7 KB Created: 2021-03-02 21:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3160df760d8d2117521cc8554a955301 SHA-1: b8ff4e060feced767819de13f8d3da11dbe15a39 SHA-256: 4368391a37ece9faf409e2f2837315b97a6c6342631410e1266b4060e62e69cc
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one pointing to a suspicious domain (jottigo.ru) that is flagged as unknown reputation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm on disposable hosting, suggesting a phishing or spamming operation. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution via embedded links.

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://jottigo.ru/123?utm_term=what+is+the+difference+between+crochet+hooks PDF link annotation
    • https://cdn.sqhk.co/buxifuludo/dEPWBih/indo_ranker_app_download.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/fudobodafaligorebamiz.pdfIn PDF document text
    • https://cdn.sqhk.co/letiludixo/mjjjahb/riders_republic_xbox_one_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/sozivowemin/Jyhajfh/basketball_throwback_jerseys.pdfIn PDF document text
    • https://cdn.sqhk.co/muxizupemof/WVShfSS/stickers_in_whatsapp_for_iphone.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/ms_word_and_ms_excel_shortcut_keys_download.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/ejercicios_ecuaciones_primer_y_segundo_grado_2_eso.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/1ggEjfI/todofu.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/gijjqI9/online_shopping_uk_food.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivajujudupogij.epizy.com/1940137999.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/event_planning_website_template_wordpress.pdfIn PDF document text
    • http://poxarow.epizy.com/panasonic_viera_universal_remote_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/3325013829.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/f1_2019_setup_guide_abu_dhabi.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/97207727460.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/roku_2021_stock_prediction.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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 5388 bytes
SHA-256: 78a021be3b7331cd1633f3cfa89594c690c970a621451e61900555dbabe95ae2
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 9840 bytes
SHA-256: 175ab88733a48dd74eb77d6b438a342dc357b7ee367d74a3cb4a914bf76a76c6

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