Malicious PDF — malware analysis report

Static analysis result for SHA-256 68423abef4ef22ec…

MALICIOUS

PDF

84.4 KB Created: 2021-03-27 21:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6b98c8a85de10b9c1c3a9c854121be SHA-1: 795ae0a29b85f9f62d1be6e4a68034171cdcd13a SHA-256: 68423abef4ef22ecff8a86a3bb66d902d9967347c67e40647fe9f19548245b42
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 embedded URLs, many pointing to disposable hosting, and one prominent URL includes a 'utm_term' parameter suggesting a lure to a search result for 'what is an estj personality'. The document body is heavily obfuscated, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=what+is+an+estj+personality
    • http://domotoj.sportsontheweb.net/zetimuvapepunulewi.pdf
    • http://vekisonoloze.sportsontheweb.net/intex_18x52_ultra_frame_pool_parts.pdf
    • http://nitafibejuze.mygamesonline.org/37847880503.pdf
    • https://cdn.sqhk.co/fapewakuw/hejfifJ/classic_tower_defense_games_ios.pdf
    • http://gejurabek.getenjoyment.net/angela_duckworth_grit_scale.pdf
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/jibinemo.pdf
    • http://nonoxutiwi.mypressonline.com/excel_analysis_toolpak_tutorial.pdf
    • http://torixewiser.medianewsonline.com/37396947963.pdf
    • http://paxezot.getenjoyment.net/nadul.pdf
    • https://cdn.sqhk.co/fuluzezufe/qicgfhg/50670931305.pdf
    • http://vutisonoj.sportsontheweb.net/report_attestation_form.pdf
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/fipamapolopalo_mawofopawa.pdf
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/fovopin.pdf
    • http://goligofalu.medianewsonline.com/reloading_supplies_las_vegas.pdf
    • http://raponikidosal.getenjoyment.net/sisumidagokipuzoxuderik.pdf
    • https://vuganolo.weebly.com/uploads/1/3/5/3/135314000/d16831db216c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rutufokedizon/50836186474.pdf
    • https://s3.amazonaws.com/kiwopusafize/c_assembly_informational_version.pdf
    • https://s3.amazonaws.com/fulosobezur/vamufowexiwasazorubebe.pdf
    • http://lenofafezanobu.atwebpages.com/rugutuxeneruboxakapiku.pdf
    • https://s3.amazonaws.com/lezopobigeza/satod.pdf
    • http://wonanikapudidak.atwebpages.com/samsung_galaxy_s4_mini_battery_argos.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_off00010ce1.bin
d9f8132ae857ed1b641adf975ba413ec6d3efb83deb83eba1f298a0965a24ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 5100 bytes
font_01_sfnt_off00011e4a.bin
c253c5dcbd44120a4b11824e827e2d95b172a835d284a14609d96555579ec740		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 11112 bytes

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