Malicious PDF — malware analysis report

Static analysis result for SHA-256 715aee25de5ba35b…

MALICIOUS

PDF

76.3 KB Created: 2021-04-29 14:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68e044c390caeacf74180737eca4bfa0 SHA-1: 7c93f87abff3e65f4e7d269d5459a0eba5a58229 SHA-256: 715aee25de5ba35bc55da5103ac2516c516c91d6e7ecee503d4b0857104c6851
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a URL with a 'utm_term' parameter related to 'APC back-ups' suggests a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=apc+back-ups+xs+1500+battery+not+charging
    • https://cdn.sqhk.co/genamudazunu/JhbKjao/drowning_crossing_rio_grande.pdf
    • https://cdn-cms.f-static.net/uploads/4455380/normal_601f3ca417a80.pdf
    • http://levojefozaloro.mywebcommunity.org/migometiro.pdf
    • https://talaxekagaros.weebly.com/uploads/1/3/5/3/135347480/guzipimifagujefif.pdf
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/3390144.pdf
    • http://vadosaj.getenjoyment.net/how_to_unlock_panasonic_air_conditioner_remote_control.pdf
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/tenovupizafebopeke.pdf
    • https://cdn-cms.f-static.net/uploads/4418381/normal_60691f8d1cbe5.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/9245034.pdf
    • https://cdn.sqhk.co/zaviresodew/A2s2qhc/td_auto_finance_late_payment_number.pdf
    • http://lorewipa.scienceontheweb.net/98941498577.pdf
    • https://kepuwizetel.weebly.com/uploads/1/3/5/3/135304134/d05866c.pdf
    • https://static.s123-cdn-static.com/uploads/4458412/normal_5ff7fc6572ebf.pdf
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/2564089.pdf
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/nevogupuka_tuwedasula_diduvoxitezaw.pdf
    • https://vesasasafej.weebly.com/uploads/1/3/4/7/134758359/rasubu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kewetanetoza.atwebpages.com/cartelle_tombola_da_stampare_gratis.pdf
    • http://weparaxopulo.atwebpages.com/hp_probook_6470b_core_i5_specification.pdf
    • http://motuvogipe.onlinewebshop.net/chinese_language_to_english.pdf
    • 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_off0000eb9a.bin
c33075a83105f3abfd8ed5ee668c65e23c2aef8eeebf8325a32a8f9827061403		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 5876 bytes
font_01_sfnt_off0000ffb0.bin
8f834d336909fa4e7c09e45578767614876c48701a352c29b4d202bfa6ee0c62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10508 bytes

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