Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbec3a4cf3c64ba…

MALICIOUS

PDF

79.1 KB Created: 2021-03-25 01:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c6bd68eb674b7a92ac34b3a9efce7b8 SHA-1: 2c3f7e87b7bad490211549fd1471be993e565a6d SHA-256: 5dbec3a4cf3c64babbde197b1f9140342ee6cb9215cf6cef3e81dc4c56f88682
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The embedded content, though heavily obfuscated, suggests a lure related to 'kicker outdoor speakers costco', indicating a phishing or malware distribution attempt. The presence of external URIs and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=kicker+outdoor+speakers+costco
    • http://dom-bita.org/how_to_change_battery_in_womens_timex_watchlqsxs.pdf
    • https://cdn.sqhk.co/xokebuzizo/eVCchie/bts_army_bomb_ocean_wallpaper.pdf
    • http://lngcliente.com/birozaxixikudonizutalowig97ax.pdf
    • https://gokebapin.weebly.com/uploads/1/3/5/3/135320588/gatanukepukab.pdf
    • http://best-store.club/blue_yeti_microphone_arm_standieu8f.pdf
    • https://cdn.sqhk.co/milevatomog/Thhg0ib/lg_g7_android_pie_features.pdf
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/8092618.pdf
    • http://sdfafq.info/weather_report_in_amritsar_cityw2z1i.pdf
    • http://pitepon.22web.org/56114506305.pdf
    • http://usene.xyz/86958664475zakvw.pdf
    • https://cdn.sqhk.co/gixelotopa/ii9jjfy/kahoot_smasher_pro_apk.pdf
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/sedoridisot.pdf
    • http://noksipals.online/what_kind_of_gas_do_you_put_in_a_chevy_impala6ykhu.pdf
    • http://vzruvayarttraff.xyz/what_is_the_menu_for_jersey_mikes_subsrcmpt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_2d82fcbc1e5e4f5eb08af922d59a4daf.pdf?index=true
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_9cb9448234de4cb0ba9cbb4e5d88b3aa.pdf?index=true
    • http://tenixebe.epizy.com/upper_back_exercises_at_home.pdf
    • http://maligufaribez.epizy.com/reactive_form_validation_disable_button.pdf
    • http://divogidiguxofib.epizy.com/new_car_games_2018_apk.pdf
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_d0f4901d04844a5eaef2fcb58d692440.pdf?index=true
    • http://fizanotafogibag.rf.gd/cima_fundamentals_of_financial_accounting.pdf
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_d6256ef9d09d492fbff1990566f566b3.pdf?index=true
    • 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_off0000f764.bin
ca7f1fef4344d2357291647b8576bc998ba7f52be6ffd6428c4a8522c8e08b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 5068 bytes
font_01_sfnt_off000108b3.bin
b4cfa251c51df498ea46e813924113a3f51c583da865596f29a84f5fac651f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 10724 bytes

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