Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ff584b52843bc2…

MALICIOUS

PDF

72.1 KB Created: 2021-06-04 07:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e30643727a632fabec0ff2908d7424f4 SHA-1: aa315a300d5cc73af2df204772709f7cc0bbbd35 SHA-256: c7ff584b52843bc292db7f0c015be699036f8afb50f97e314888b309b2d9641c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one specific URL is identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/123?utm_term=allen+sports+102dn+manual PDF link annotation
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/7731519.pdfIn PDF document text
    • https://vefigemeg.weebly.com/uploads/1/3/4/3/134368147/newepewisog_vewujaxamezu_zizepexobupejuv.pdfIn PDF document text
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/foretakires-demasedigemow.pdfIn PDF document text
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/dowilesukidivo.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/wiwadu.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/f3cd3c6c-2ffb-4ad2-be20-52d96f5ae40a/51412514172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a99f6d1-c75c-49b3-9553-910ba1fca0dc/kory_floyd_interpersonal_communication_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c95936-9728-4f2b-9777-7927701aa6ab/how_is_matter_and_energy_cycled_through_an_ecosystem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6971813-8180-4559-bbae-e1f2c726c557/jobuwexajavipuvox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36784c8f-9f0e-4b2e-bc8b-1a4146268584/vipogakape.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144517374/kitudopowali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c952c4-3c95-4f4b-8e14-8eb188d49b59/24630490634.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/18366618209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bdf6e2-ca9e-42a9-b542-4701adb09985/wahl_nose_trimmer_walmart.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144532476/why_v_model_is_better_than_waterfall_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf95089e-997f-46c2-a83c-872580342c1e/who_is_the_richest_storage_wars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36acb8be-de1f-4dfd-aefc-3ead421050aa/cuisinart_custom_14-cup_food_processor_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d779d99-7ad4-498c-8598-b2cef013b2b0/sample_paper_in_apa_format_7th_edition.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/converting_between_metric_units_of_area_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa7290f-3db8-4817-9ca9-cc1bd57971fe/424548888.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_off0000dd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 5420 bytes
SHA-256: 4f7d50cfaa2b7eedb02e2c99050df486e9dbb2b3592067e90ee5deea697c3976
font_01_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 10392 bytes
SHA-256: 44a9bad0f782b56612a8ba1f00d4952bddcf4b675d2f400feb981549589af865