Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebdeada6d0f3b8f…

MALICIOUS

PDF

72.9 KB Created: 2021-02-26 23:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: db56fda3d9017b1f44ff1c1f0510da73 SHA-1: 7f9705c29b2205407c1901ae945b44124f377632 SHA-256: bebdeada6d0f3b8ff1aa70bb49beca0f89e45ba80d93f463e570c5be9ce8ba21
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The primary attack pattern observed is the creation of a link farm, embedding numerous external URLs designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest an attempt to exploit users through redirection, likely as a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/123?utm_term=is+vizio+e320vl+a+smart+tv PDF link annotation
    • https://cdn.sqhk.co/juxerawabuf/ToBr0jf/64551975655.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/jHqhdnO/corpse_party_blood_drive_en.pdfIn PDF document text
    • http://vujabix.22web.org/delegation_of_financial_power_rules.pdfIn PDF document text
    • http://webpost.pro/4233377018uk2og.pdfIn PDF document text
    • https://lexabefi.weebly.com/uploads/1/3/1/3/131384613/e0afd5cec.pdfIn PDF document text
    • https://gulipuzajetag.weebly.com/uploads/1/3/5/3/135397689/tuserigozabefep-zasorisazi.pdfIn PDF document text
    • http://autobuff.xyz/392770272858epa9.pdfIn PDF document text
    • https://zujakeme.weebly.com/uploads/1/3/4/0/134041616/woreji.pdfIn PDF document text
    • https://jezelide.weebly.com/uploads/1/3/0/8/130874318/zizajel_kirano_kuwif_rivafuma.pdfIn PDF document text
    • http://yandex-delivery.cc/samsung_bd-j7500_factory_resetexjcl.pdfIn PDF document text
    • https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/257a9b6.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/PxPgehf/leaving_on_a_jet_plane_lyrics_armageddon_soundtrack.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/guzogubuzela.pdfIn PDF document text
    • https://xelixexojiga.weebly.com/uploads/1/3/4/1/134108676/7103815.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/vububax-nudonobokogenun-rizupakat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxozuzupa.rf.gd/92677418362.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/aemc_megohmmeter_1026_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/android_emulator_pc_games.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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 5316 bytes
SHA-256: 4cd136d97c97a5f5294787ad9628328b35d659fb0f27600907af5f3009712371
font_01_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 11080 bytes
SHA-256: af5488aa508ac731cf0a0d72f7201ae27f395563663bb42a9b54b45c3b6e9fc5

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