Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c448da63372210f…

MALICIOUS

PDF

80.8 KB Created: 2021-03-06 10:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9dda8d6bb84d472ace405906f3428d31 SHA-1: 4f58d72be41617add34d18f82f04abaf38d913b6 SHA-256: 3c448da63372210f013e7ca26f8d67751d414ae9ed957c803e859d07bf965d3b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains external links, including one to 'vilenefex.ru', suggesting it may be used to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/123?utm_term=how+to+set+electric+timer+switch PDF link annotation
    • https://cdn.sqhk.co/sedazozesufu/9qjek1h/nogasavagopavujopuzuzupuk.pdfIn PDF document text
    • http://galajanexagaj.iblogger.org/verizon_fios_quantum_gateway_firmware_update.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/f39ihMK/cyberspace_tanks_3d.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/lonely_planet_japan_book_depository.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/s6gciUe/on_my_own_les_miserables_sheet_music_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444869/normal_5fdc78c08be69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452846/normal_6005484a111a6.pdfIn PDF document text
    • http://xozawuledol.iblogger.org/avast_for_windows_xp_sp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_60117c72b3640.pdfIn PDF document text
    • http://xajoboki.iblogger.org/garmin_nuvi_2689_mount.pdfIn PDF document text
    • https://cdn.sqhk.co/guzikiku/jayMkic/download_aplikasi_maps_of_clash_of_clans_terbaru.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/vokimolef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_601f52ca63869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buxozowiliva.rf.gd/crack_bigasoft_total_video_converter_6.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/john_deere_42c_mower_deck_parts_diagram.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/coleman_hot_tub_error_message.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/69370423146.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/desperado_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dab90f0-63d2-4dd6-b2e4-f5a070339063/jemuxodefipilutukik.pdfIn PDF document text
    • http://kasedabinat.rf.gd/ravem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d15e52-db9e-4219-aff3-9acb2ade3b17/black_and_decker_food_processor_replacement_parts_fp2500.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/nanda_nursing_care_plan_for_diabetic_retinopathy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3db7bba-02e5-4482-b3d3-dc7f48f523d2/how_to_pray_for_a_good_spouse_in_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bde6dba-2968-4673-930f-efd3f2f09964/logeropujolevibibeparav.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/how_to_make_your_hp_printer_print_in_black_only.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_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 4880 bytes
SHA-256: ca574c5518294a80563eb04769a2231be0c2b65824502f0f9edc7aef7d958d5a
font_01_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 10820 bytes
SHA-256: c0f4dd695b339b90d4a5a334500af5cabdffc4c9de3b7e69a7e7c947dc7c127d