Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e1c5bcccdf9ca6…

MALICIOUS

PDF

82.8 KB Created: 2021-03-12 20:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 48da84b02e4864dfaf0684b6c0427e5a SHA-1: 311b516f44a497c9d667339e1928ce7643eff04b SHA-256: 71e1c5bcccdf9ca696b9bbff64beed836d508435c868d56045a75d4024b65d86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/aws?utm_term=porter+cable+air+compressor+150+psi+4.5+gallon PDF link annotation
    • https://cdn.sqhk.co/kerikone/agciihb/progress_report_project_management_example.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/j9zfjbN/lip_art_3d_free_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/bofotabi/eKicfgh/unified_products_and_services_franchise_review.pdfIn PDF document text
    • https://cdn.sqhk.co/nezuxada/hjKkOhj/dijowa.pdfIn PDF document text
    • http://nigamenivikuki.iblogger.org/39204200780.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/ijiuhfw/oceanhorn_walkthrough_withered_lands.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/fhfjb1Z/memelife.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/j9gj7KF/barbie_dreamhouse_adventures_cast_behind_the_scenes.pdfIn PDF document text
    • https://cdn.sqhk.co/fipudiroj/NIqrggb/14621547351.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/how_do_you_reset_an_amana_washing_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/cuxifhe/best_free_gun_simulator_games_for_iphone.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/43c4884e-79da-49df-954a-0aecd87bd149/kogobijalegezafuwi.pdfIn PDF document text
    • http://sinusisokopex.atwebpages.com/rzr_xp_1000_clutch_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22bc8c4-d114-41ff-956c-e4710e378782/vanished_left_behind_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21455fa7-ec65-44fe-8291-f867ebf280b8/the_band_the_last_waltz_cd_track_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1ed3b1-62ef-4e8a-8dd3-e29b00ad6adc/pugujoxamodupekunukofor.pdfIn PDF document text
    • http://novorekafagodab.epizy.com/48350397221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4fb311-4eb4-4bec-9e29-5e2684fc00bd/how_to_tie_your_jump_rope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/416a3fdf-f304-4bc8-b132-6a0fbeb5608c/zoom_h5_vs_h6_for_music.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/spalding_50_inch_polycarbonate_portable_basketball_hoop_system_assembly_instructions.pdfIn PDF document text
    • http://dovobol.epizy.com/how_to_record_a_run.pdfIn PDF document text
    • http://sarovagovoz.rf.gd/lifexowamutekegebalug.pdfIn PDF document text
    • http://xamopogowidori.rf.gd/35246001891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd1bb0f-7143-4ca1-aa13-fa8ff61998c9/tratamiento_para_covid_19_en_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca1608b-99ed-40ae-9145-ffeae5b7c702/44316864687.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_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 5832 bytes
SHA-256: 73af8b7b1a103961fc50ccbec813b980040524b96c0c78363934b5525b894ce1
font_01_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 11392 bytes
SHA-256: 5bbaf8593ccbccc56a118b056e8b3a92b30da72154072686c6414165f6e8493d