Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4957b3d3cdc38fc…

MALICIOUS

PDF

72.7 KB Created: 2021-03-10 18:14:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9279df5d0ff0451e94ec154bcaa19f8 SHA-1: 1f12e0621ea6caf06d1eeeeddee80aca38f9a600 SHA-256: a4957b3d3cdc38fc759d5643a6befd2af5cc8e3ea8e4de6f86e344df67b0ef2d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are presented as download links for games or software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it functions as a downloader or phishing lure.

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://midufefew.ru/wix?keyword=pretentious+game+4+unblocked
    • https://cdn.sqhk.co/pomorezolo/gjgghbw/scarfall_the_royale_combat_download_uptodown.pdf
    • http://tosefabebiribow.scienceontheweb.net/aluminium_profiles_for_windows_and_doors.pdf
    • https://cdn.sqhk.co/duloputemab/ji3gejd/zijabu.pdf
    • http://xariketixagat.mypressonline.com/sennheiser_rs_175_rf_wireless_headphones.pdf
    • http://lejifip.sportsontheweb.net/hospital_waste_management_thesis.pdf
    • https://cdn.sqhk.co/lawafopugu/A5igfvK/92524185069.pdf
    • http://fafesixokegigi.getenjoyment.net/new_korean_love_story_movie_2019_with_english_subtitles.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dowesitobuga/bogogefoluk.pdf
    • http://getutefuma.rf.gd/flotec_pump_parts_canada.pdf
    • http://nejimafalun.onlinewebshop.net/traxxas_stampede_2wd_vxl.pdf
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_de5d050fc8cc49bbadc9ab52b8e89216.pdf?index=true
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_bff81a057dc24bf8a40142b1689c7d38.pdf?index=true
    • http://bemawom.rf.gd/fm_approval_guide_building_materials.pdf
    • http://bexukavibume.myartsonline.com/petsafe_yardmax_transmitter.pdf
    • https://s3.amazonaws.com/mojivikapeti/banofiganotevo.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_58665ef138094f1b992e5c6e56d44842.pdf?index=true
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_519dff28354e4fadbaebd07d6b53ff7b.pdf?index=true
    • https://s3.amazonaws.com/nafibanefexex/what_is_process_service_dispatch.pdf
    • http://xabudavadeguvo.myartsonline.com/jumibidesidagatigux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2bd.bin
2ac4f5ecc45c40bf0587ea19f253cb52728597efc198be996667a25069c68ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 5436 bytes
font_01_sfnt_off0000e51f.bin
20159ddc618c854203b782512885a5909700746aefaf2e489b34250c3f98d9bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 10024 bytes
font_02_sfnt_off0001076e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 4324 bytes

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