Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c225bfd93280898…

MALICIOUS

PDF

81.4 KB Created: 2021-04-06 02:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 531b3a2dba69932adb2038577aadd38b SHA-1: f91e583cffabbbab7d81e2f7456ae0c3d713d51c SHA-256: 9c225bfd9328089818038d8944139c9f45a87e81e1b59c43fac05bcb021b04ea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/award?keyword=dowells+cable+gland+catalogue+pdf PDF link annotation
    • http://matrixbicycles.com/periodic_trends_worksheet_answer_key_atomic_radius2ajjr.pdfIn PDF document text
    • https://cdn.sqhk.co/gorusuvu/ghhpjAX/old_skype_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/81UTVAm/gepetobapes.pdfIn PDF document text
    • http://vulifux.66ghz.com/bogle_book.pdfIn PDF document text
    • http://ketousa.site/456716833696glnv.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/tekuleburobilu.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/joSidjg/90526367593.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/how_to_use_palmers_coconut_oil_formula_moisture_gro.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/icgdhhd/best_customer_service_number_for_at_td_bank.pdfIn PDF document text
    • http://rigovutamejebum.iblogger.org/talk_on_walkie_talkie_review.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/educao_para_a_democracia_anisio_teixeira.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/eI2usbp/97772973392.pdfIn PDF document text
    • http://stroiline74.ru/microsoft_access_2010_free_training8e1mz.pdfIn PDF document text
    • http://dedigevobunobe.medianewsonline.com/ascii_hex_codes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiforeru.atwebpages.com/anualidades_anticipadas_matemticas_financieras.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_bae4bd849aee4e81b5f7057813fca9ee.pdf?index=trueIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_606ec0bcf4664f6cbb4699c712239479.pdf?index=trueIn PDF document text
    • http://fowimifefezujo.myartsonline.com/gugefopek.pdfIn PDF document text
    • http://nogafojomor.onlinewebshop.net/38339510927.pdfIn PDF document text
    • http://mowixir.epizy.com/oscar_award_2020_winner_list.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_58eff8d2f15a48cb812fcae86be2039d.pdf?index=trueIn PDF document text
    • http://mojigoka.atwebpages.com/epic_games_tom_clancys_rainbow_six_siege.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_6984c426ad6948c5b114636051d5da2e.pdf?index=trueIn PDF document text
    • http://gupizamowakop.myartsonline.com/81315420790.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_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 5460 bytes
SHA-256: 9d1ae33d0aa433781108da3d2f0c7ae6ac98e331cdff10424f82311753f2373f
font_01_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 11564 bytes
SHA-256: 0a48799a2238c7af24e42ca6addc5d19856f2120cc1a57efbd9895d561043dfd
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d