Malicious PDF — malware analysis report

Static analysis result for SHA-256 d503b5fbd74503b7…

MALICIOUS

PDF

103.0 KB Created: 2021-03-15 05:34:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 636294fa363d7dc6794325a83ff35397 SHA-1: 5402ee1489e9fb1857cfc5a931419c9c8c194cd0 SHA-256: d503b5fbd74503b79d0e1584f5f9a818e65093b21d12924439c3a6535b8a77db
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded links, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to investing guides.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://botokaw.ru/award?keyword=a+beginners+guide+to+investing+ivy+bytes+pdf PDF link annotation
    • http://tufofol.medianewsonline.com/81094038839.pdfIn PDF document text
    • http://taxutipepavij.iblogger.org/54375010550.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/F7LifFv/kiwekixerasijirurejimetun.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/hd0hdOl/dobofozajuneritewijijew.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/hjfcigA/teacher_appreciation_gifts_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/fgchcgg/tazojivumopuvod.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/cichhjh/puzzle_bubble_games_for_pc_free.pdfIn PDF document text
    • http://dowinonajapa.iblogger.org/phonetic_transcription_symbols_list.pdfIn PDF document text
    • http://jodopafipunew.22web.org/watuletet.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/jb6ihMy/g_force_race_cars.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/6uhcjNi/pilot_freight_services_jobs.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/95184842068.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://tewidunutazi.rf.gd/67818067157.pdfIn PDF document text
    • http://tilitun.epizy.com/circuit_mesh_analysis_examples.pdfIn PDF document text
    • http://keguwaburafokul.epizy.com/35378690380.pdfIn PDF document text
    • http://jujobope.atwebpages.com/principales_problemas_sociales_y_economicos_de_mexico.pdfIn PDF document text
    • http://jovigoxuja.epizy.com/whats_the_best_drink_to_get_at_dunkin_donuts.pdfIn PDF document text
    • http://vumebef.epizy.com/bee_movie_game_pc_completo.pdfIn PDF document text
    • http://zapuvem.epizy.com/91683995351.pdfIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/how_to_read_music_notes_faster.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/81918193371.pdfIn PDF document text
    • http://togaretib.epizy.com/audi_a6_allroad_2014_owners_manual.pdfIn PDF document text
    • http://kizosit.rf.gd/motorola_h730_bluetooth_headset_walmart.pdfIn PDF document text
    • http://gizivafufet.rf.gd/eagoler_chokh_full_movie_hd_1080p.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_off000145cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CF 5140 bytes
SHA-256: 27fb8193fd753bf518b18cd034e0d20c042a8caa47ac828726f932db62684c7b
font_01_sfnt_off00015760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15760 12112 bytes
SHA-256: 863104ae74200d3d4b1c7931c40b329f7503d9b07b60c8faf6154ac525d7a160
font_02_sfnt_off00017e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E32 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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