Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac47998478647fb9…

MALICIOUS

PDF

103.5 KB Created: 2021-03-15 00:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9d3b12a4b9329f9e6e64c9345b013126 SHA-1: 27df64fd3b8bf2a6ec769a7e85e6d8ec6cda78f9 SHA-256: ac47998478647fb98158326d44caa6041b524d1112193a6c97d11fd027645e80
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external URLs, with one prominent URL being `https://maypoin.ru/strik?utm_term=bob%2527s+burgers+episode+1+script`. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and ML classification further support its malicious nature. The document body, though heavily obfuscated, suggests a lure related to 'Bob's burgers episode script'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/strik?utm_term=bob%2527s+burgers+episode+1+script PDF link annotation
    • https://cdn.sqhk.co/tezejikibus/Vk0jehb/understanding_policy_success_rethinking_public_policy.pdfIn PDF document text
    • https://cdn.sqhk.co/voravaxa/biigicz/ice_age_village_wiki_animals.pdfIn PDF document text
    • http://rusakadovub.sportsontheweb.net/41925790378.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/igcUYn6/struckd_3d_game_creator_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/giygiAU/does_directv_have_nfl_network_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/9vjfHgh/92019785878.pdfIn PDF document text
    • http://xuzotudaraderuf.mypressonline.com/kalezebikudipege.pdfIn PDF document text
    • https://cdn.sqhk.co/bedipidis/ggXgjK0/sbi_customer_animal_restaurant.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/gdevCid/sudoku_247_hard.pdfIn PDF document text
    • https://cdn.sqhk.co/nufuwijili/JQIicLp/knives_out_no_rules_just_fight_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/hdbhdid/keto_cooking.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/7eibuji/tesivugafofujufobiguke.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/Bgj6Cgi/twitter_header_size_template.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/lfgj9WB/servicenow_quick_messages_mail_script.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/jgfZ4ij/gmat_aptitude_test_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/christmas_songs_tagalog_free.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/76612910528.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/gosorafo.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/lufomajegevewumutu.pdfIn PDF document text
    • http://fimuwudefixolet.epizy.com/brother_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/44245777860.pdfIn PDF document text
    • http://nebakeditawow.epizy.com/allen_roth_ceiling_fan_light_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/64036823899.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/zebikuniziwukozedeputev.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/fejelak.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E0 5272 bytes
SHA-256: 6e5b9d797867280a95752c317f0c7536e31548f981860ad3dcb4bfd6c0a2923b
font_01_sfnt_off000167e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E9 11520 bytes
SHA-256: e3a383a506577281917fdd14f9ec676b2ec4e0b144669ff75c64c34c9fbfd725

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