Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca36f9d44e24b7b7…

MALICIOUS

PDF

95.1 KB Created: 2021-05-10 05:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 961f9fbe4d83dedef8b2e077a7642e10 SHA-1: 2351643712d6fe1af720080d77e698d2d67878f0 SHA-256: ca36f9d44e24b7b72790c654cc5313955e207026ee14d1164991ba38c7ade475
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan delivery. The primary malicious URL identified is https://pelibifir.ru/strik, which is likely the destination for users seeking information on the 'petsafe collar blinking red' query.

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://pelibifir.ru/strik?utm_term=why+is+petsafe+collar+blinking+red PDF link annotation
    • http://terem.space/wow_auctioneer_addon_guide7dems.pdfIn PDF document text
    • http://clientesdkb.com/fugafuludilupomidafovetiys9tr.pdfIn PDF document text
    • http://zuvels.xyz/46853210014leu9n.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/87384442059.pdfIn PDF document text
    • http://igcopyrightforhelps.com/bombsquad_apk_mod_file0r251.pdfIn PDF document text
    • http://vvinorama.website/kansas_city_hornpipe_bagpipe_sheet_musiccstoq.pdfIn PDF document text
    • http://gelchlen.fun/52760814877w4qo9.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/gestalt_therapy_verbatim.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/mabeduzefubakugixsdhxs.pdfIn PDF document text
    • http://kyrgyztours.com/employers_workers_compensation_classification_guidelnx9q.pdfIn PDF document text
    • http://fapseo.ru/how_to_put_echo_buds_in_pairing_modejf875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupegamag.epizy.com/asperger_s_in_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf485f5f-8d6f-43d6-ba76-e59564f39ee7/vumenaraxefomamugewili.pdfIn PDF document text
    • http://lazevemu.epizy.com/bosch_washing_machine_service_manual.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_ce440f1951564a6e9309507d7cba3a19.pdf?index=trueIn PDF document text
    • http://gavawekib.myartsonline.com/aday_retmen_hazrlk_kitab.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_f1beda16fe1b4dbead0180d691605115.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a971400-1a4d-4243-84b3-86e8b5f086c8/3418061522.pdfIn PDF document text
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_c5c06e4570024becbf0c18b8ad5d45b3.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_16af92d670454fc787db9774c6ea9f50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63817ca-e219-4eb1-975a-7337c89a02e3/kidde_smoke_and_carbon_monoxide_detector_low_battery.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_f0f2d509d4df4ecba7531edb68fe5e59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/189442d2-69a4-4607-8cae-601bfbaeadd4/80694519644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e54c43-aa8f-44a1-b8a6-c61a9db0959b/how_to_use_wireless_ps3_controller_on_pc_windows_10.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 5736 bytes
SHA-256: 2a5f431cb486b3301f358aa9e467cae5fd69290a8da38e1820d566e8d2e17470
font_01_sfnt_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 12512 bytes
SHA-256: 816dabf7d5558a85b44dc66e1f88fb5c35679451bdc4ee4dbb524b17081591b6
font_02_sfnt_off00015a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1C 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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