Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d0173fc721a737…

MALICIOUS

PDF

120.4 KB Created: 2021-04-23 02:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2645f172a9ab330eb414ee39c77f530a SHA-1: 2f1daede987b6718f0ffe2b7d033883d0f09e3f4 SHA-256: c8d0173fc721a737fef1f1031fee85d5d4ce460728c733230be37a67e7e7765d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://seumenha.ru/strik?utm_term=pasos+para+la+administracion+de+medicamentos+por+via+subcutanea PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475861/normal_6028bf9cec236.pdfIn PDF document text
    • http://susuwefusedev.iblogger.org/44246068417.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/c3hjzhh/new_instrumental_ringtone_2020_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_604b37611b3fd.pdfIn PDF document text
    • http://rezefad.22web.org/98194168807.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/0jjgjie/ziwenifijopelifudutag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_5fd17b7f8a5be.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/autoestima_en_adolescentes.pdfIn PDF document text
    • http://biteroz.iblogger.org/gosuva.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/fMHjjr7/jodowosepawomojejig.pdfIn PDF document text
    • http://devuweza.scienceontheweb.net/600767012.pdfIn PDF document text
    • http://penageli.getenjoyment.net/how_do_i_get_the_rust_off_my_cast_iron_grill_grates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_6024734e9d44a.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/vafamowunovakefulebirimi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefepelifepo.rf.gd/air_force_question_paper_file.pdfIn PDF document text
    • http://xaposekesudonod.epizy.com/lean_six_sigma_green_belt_body_of_knowledge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78415d4a-20ed-4426-8a5a-cec20cae9275/how_to_clean_dyson_mini_motorhead.pdfIn PDF document text
    • http://keberefan.rf.gd/49902476051.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/asus_rt-n12_d1_router_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70eedd82-bd9b-4450-9629-cf857b7fa347/16070543108.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/quilts_etc_sheets.pdfIn PDF document text
    • http://sisukedazigi.epizy.com/mandarakavile_psytrance_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2895df96-a150-42ff-b51d-12dc51ebd207/54618688851.pdfIn PDF document text
    • http://vinuwivuko.rf.gd/allen_bradley_powerflex_4_manual.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_off000196e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196E8 5420 bytes
SHA-256: 0e6db7e3911dccad5d6367a7e182d1329f87d58f4fef1d2bd6a6157915827611
font_01_sfnt_off0001a93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A93A 12492 bytes
SHA-256: cf3490c543b256dd1443ab98f0a7522eb9efdb181cbd76fdd4619ca44039057f

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