Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93c3ec775c0ab14…

MALICIOUS

PDF

85.3 KB Created: 2021-03-26 06:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 65f5c580391e169aef59c50bc6eae1c1 SHA-1: d70fd314a4f872ded8f22d56fe3495ac81d493b7 SHA-256: f93c3ec775c0ab14cdaaf7e5dfa6c92b91ed94df351455f4f1e01e05557d41cf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic. One of the embedded URLs, 'https://nipisod.ru/wix?keyword=celtic+heroes+mod+apk+free+download', indicates a lure for potentially unwanted software downloads. The PDF structure and link farm behavior align with phishing and SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://nipisod.ru/wix?keyword=celtic+heroes+mod+apk+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486742/normal_60220589bffde.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/fisalasosujute.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/82568331825.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/6853322553.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/wapimanefidoni_mabonej_wijipik_gozizajamuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fc5f7f90704e.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/calculus_early_transcendental_functions_4th_edition_free_download.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/accords_guitare_basse_4_cordes.pdfIn PDF document text
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/renobasub.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/is_a_2000_buick_lesabre_a_good_car.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/cdba660b-e85b-441c-aacc-649309098624/meade_etx_125_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fd940b-02cd-4875-a20b-0e067b296a6e/64527165259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c95d3c-a1d9-4eb4-81f6-70dedaaba0ca/how_to_start_a_ariens_deluxe_30_snowblower.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/electric_circuits_brainpop_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98196ae-060e-4eca-918f-4b1988474afc/llama_llama_red_pajama_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b466efc1-1037-414f-b702-d0946c4b2fb0/burger_king_nearest_me_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34717dde-ff9a-47b6-86aa-f57b1c0cd3f0/what_does_frankenstein_symbolize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4281925-4749-4f76-83b5-62932d61b1cd/mfj_945e_antenna_tuner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8441c090-11c1-4b8d-92a9-df6ca839157b/xotic_sp_compressor_specs.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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 5456 bytes
SHA-256: bd99a8b9e221aaa3f30285d15321addcdbc1ee30e199d62f6bbdd0c4734dc227
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 16328 bytes
SHA-256: 03bf5cbc449d3dbd443f7b961827c379a24ff4a648958658b4a00c1cad3fa3a4
font_02_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 16180 bytes
SHA-256: e91a11c59a2051795d586c814c3ff8757614164f1cf0efd6c29e2b763914dc81