Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1a9b74c71b1062…

MALICIOUS

PDF

82.4 KB Created: 2021-04-14 18:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 90962a0e3e6a8c02d912c24b5f172205 SHA-1: 21167b51150b0231d2874b7a0471819781773498 SHA-256: 9d1a9b74c71b1062e41b0c278ca01335fdd06ed18fc681dba82cb32edec5006a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with several pointing to disposable hosting and potentially malicious domains like kuzutuzo.ru. The presence of these links suggests an attempt to redirect users to phishing sites or SEO spam content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/strik?utm_term=frigidaire+stackable+washer+dryer+not+draining PDF link annotation
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/2801102.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/Sgd9jg1/how_to_say_hello_in_french_creole.pdfIn PDF document text
    • https://xifabaruwene.weebly.com/uploads/1/3/0/9/130969291/kedope.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/iiYe2ij/alto_s_adventure_free_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/tolebilu/nYj8XGJ/gojo_hand_soap_safety_data_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/giidhbi/rigelitupenogax.pdfIn PDF document text
    • https://jiwazumirinupe.weebly.com/uploads/1/3/4/3/134352382/rujusofoj.pdfIn PDF document text
    • https://cdn.sqhk.co/lotidonita/RhfjfWP/96811553823.pdfIn PDF document text
    • https://wimatuzufuduwo.weebly.com/uploads/1/3/1/8/131871585/loguv-mazelo-tonolelebol-kejoj.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/ejcgehg/paladone_duck_shoot_carnival_and_fair_interactive_game.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/51fd1f.pdfIn PDF document text
    • https://rejejowurodesom.weebly.com/uploads/1/3/1/3/131398559/velozidemixus.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/5279155.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/c1jcMhe/secret_of_mana_ps4_flammie_trophy.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/oDEeiej/64177222511.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/ibQhigh/jugulazazanukepoxob.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/agigjgv/free_police_scanner_app_canada.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/28ec1bee384d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7979f0ad-7b60-41c1-89c5-ff3156e31468/does_spectrum_cable_have_nfl_sunday_ticket.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/sonic_bomb_alarm_clock_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/acuerdo_de_cartagena_madera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1fd066-ece9-4a05-887f-2c1756e864c3/xoduzomikig.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_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 5556 bytes
SHA-256: 558f233411da1c42904c2c2e97a622fdcf5ffa69be0d9eec74940825a78b7074
font_01_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 10516 bytes
SHA-256: 7a0fb899da6c1ee3aabc9b004d3dfdb55fb57890109acc76e12f2aaf1767c656