Malicious PDF — malware analysis report

Static analysis result for SHA-256 0545cf90e0f8ddd7…

MALICIOUS

PDF

72.4 KB Created: 2021-03-08 11:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 511401b66daac6f76fdee280e139cce7 SHA-1: c715753c7a8f0dc04f2b6b8867b30d0644d3bd7e SHA-256: 0545cf90e0f8ddd7dec8d674ebb07c86d4bfa55a51285b460337d1c078ef3315
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content or redirect to phishing pages.

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://soxebez.ru/award?keyword=altium+designer+tutorial+for+beginners+pdf PDF link annotation
    • http://kinemulawaw.sportsontheweb.net/model_3_long_range_vs_performance.pdfIn PDF document text
    • http://golden-bridge.pro/introductory_econometrics_a_modern_approach_6th_edition_solutionswfvm0.pdfIn PDF document text
    • http://tryne.xyz/kgf_background_music_telugu_naa_songslpd6h.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/uniden_um380_replacement_parts.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/98090296216.pdfIn PDF document text
    • http://batmbatm.ru/42510719771zbstf.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/kafin.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/los_5_lenguajes_del_amor_test_para_esposas.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/excel_macros_for_beginners.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/33488756786.pdfIn PDF document text
    • http://zofugef.mypressonline.com/53548852433.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/pidegude.pdfIn PDF document text
    • http://you-bestshop.xyz/funniest_mens_halloween_costumes_20208wip3.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/64236414399.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://madanekobovuge.epizy.com/zufetibogatupedafoba.pdfIn PDF document text
    • http://purewowesajumu.myartsonline.com/python_data_analysis_practice_problems.pdfIn PDF document text
    • http://rumudojipa.epizy.com/autodesk_2016_keygen_xforce.pdfIn PDF document text
    • http://deravamosu.rf.gd/sap_crystal_reports_2016_upgrade.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 5492 bytes
SHA-256: 241c2b761ee2bf228c5e7c67006701773a3b47259b08078f116ab577344e347a
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 10104 bytes
SHA-256: 005bc372ced63ab92827c8ec1604808a91432366236c969d9f00e27844066cc1

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