Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5ef4653948b069…

MALICIOUS

PDF

87.2 KB Created: 2021-03-21 06:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 420e2e5ea0f3fa43d7ba8c101a31ea94 SHA-1: 782570163473ed28c87b8bc71eb5b716813e14c2 SHA-256: ab5ef4653948b069a72caf734c3d6c949b8c604fb13ba02b847dd71c8e5a2fa0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or malware distribution by directing users to external sites. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

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://golowaki.ru/strik?utm_term=what+is+syntax+sentence+structure
    • http://reestr.site/tp_link_mr3040_manualwvdjz.pdf
    • http://feedbacrnz.space/windows_10_activator_kms_freews2jz.pdf
    • http://fofiwafajelerax.sportsontheweb.net/92540675875.pdf
    • http://firavowinoza.iblogger.org/zijutimizonegejunijusa.pdf
    • http://sikakapu.medianewsonline.com/appsc_group_1_syllabus_in_telugu_medium_2020_download.pdf
    • http://4kuhd.me/pixel_shooter_3d_mod_apk_download8i2p9.pdf
    • http://zemegazi.22web.org/xabatajisegofun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mavixu/6098884262.pdf
    • http://keligidi.rf.gd/cen-tech_battery_charger_reviews.pdf
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_0b11cf70f61c408587f09537342eba45.pdf?index=true
    • https://s3.amazonaws.com/rutufokedizon/autopsy_reports_public_record_illinois.pdf
    • https://s3.amazonaws.com/tonemakopinibem/46606206801.pdf
    • http://lijivuzase.rf.gd/85147751428.pdf
    • http://nibopinalilabaj.onlinewebshop.net/albert_bandura_self_efficacy.pdf
    • https://ab38f0b8-b274-4020-91f3-e6554b072184.filesusr.com/ugd/9c43ec_1fec2ffbef3448bebda9c79b6e5166ec.pdf?index=true
    • http://zuxokoberibaw.atwebpages.com/yard_machine_snow_blower_10_hp_24_inch.pdf
    • http://nejarisiwudu.atwebpages.com/89444743016.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_off0001111c.bin
eef96fd6ed3c0911ee1500347af832d0a456f8179d29a804d19c9c8a45767583		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 5036 bytes
font_01_sfnt_off0001224e.bin
8a78a306e154bbcd307bbd8411c6b07466cc3f2a1e801084cf07b444676c8ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 14308 bytes

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