Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea5b25aac607213…

MALICIOUS

PDF

76.3 KB Created: 2021-02-20 15:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1eea10c8f7cedbf5b74ef51808f9d197 SHA-1: dbff931436d60562cd57ae8b2f7802f1686236fc SHA-256: fea5b25aac607213f98bb42e5c6be448fa235207f1764129eec2a91be4d64974
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, and a high ML score combined with ClamAV detection indicates malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to distribute malware or phish users. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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://leonvi.ru/wix?keyword=thermal+energy+problems+worksheet PDF link annotation
    • https://cdn.sqhk.co/kujusiru/cZfdhdV/41690930727.pdfIn PDF document text
    • http://handler-autoscout24.com/2015_ashrae_handbook_hvac_applicationszysfc.pdfIn PDF document text
    • http://2022god.com/element_32_inch_tv_standu49qe.pdfIn PDF document text
    • http://mavpa.fun/xitinevebapavopafizarag4h34.pdfIn PDF document text
    • http://korecos.ru/the_forager_s_harvest9lbig.pdfIn PDF document text
    • http://bedating.online/rawinuru2jdis.pdfIn PDF document text
    • http://national-verifyteam.com/ernest_hemingway_indian_campzrcyf.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/ehb6t07/kakasiwotu.pdfIn PDF document text
    • https://cdn.sqhk.co/bezupidokaz/0iaOgmg/songflip_free_music_streaming_player.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_600a052e781cf.pdfIn PDF document text
    • http://pop-marketplace.ru/809986868991ro43.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/jNijXeV/38244540388.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/AjfzIhi/juegos_de_bounzy_2_3_4_jugadores.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/cp6aSgX/jump_start_car_battery_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/Vjdichb/breyers_french_vanilla_bean_ice_cream.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/jigghif/vr_roller_coaster_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kesopepi.rf.gd/pentair_easy_touch_remote_pairing.pdfIn PDF document text
    • http://repenebaroregom.rf.gd/administrador_de_archivos_apk_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 5320 bytes
SHA-256: 6d48280debb66a23d3e67a673579336f7c8f4206c3079cd0c44573b3a66dac76
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 10776 bytes
SHA-256: 9fd61eef0e16e6e53a0d093a781ae77a3980f82f60d04a6efc6c00a078782b72
font_02_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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