Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78c9751a9bbaf27…

MALICIOUS

PDF

76.0 KB Created: 2021-04-03 14:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 63cbeeb6fa212d40b626bfed355ed5c3 SHA-1: d28e9fc96e3e7d61045308b5de88a6a82846f05b SHA-256: b78c9751a9bbaf279f9eb5a1e689290f66a95b70fc71d788712fef53ade8f6d9
184 Risk Score

Malware Insights

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

This PDF file is classified as malicious by multiple heuristics, including a critical finding for a malicious redirector link. The embedded links, such as 'https://dafemum.ru/strik?utm_term=star+trek+discovery+script+pdf', are designed to lead users to potentially harmful websites. The document body, though heavily obfuscated, contains references that align with a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=star+trek+discovery+script+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5fc619cdce372.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/the_power_of_kabbalah_free_download.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/metal_cutting_blades_for_black_and_decker_jigsaw.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/jg4ii4p/slither_2_movie_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445541/normal_5ff301c2d36cc.pdfIn PDF document text
    • https://cdn.sqhk.co/satovepato/Ug2iihe/22222754861.pdfIn PDF document text
    • http://vevapefin.sportsontheweb.net/73441381556.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/fender_mustang_gtx100_modelling_combo_amp.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/adobe_writer.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/aVrgf4l/22194713592.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/9815694748.pdfIn PDF document text
    • http://kunutudusoxa.mywebcommunity.org/xidatoxedexewi.pdfIn PDF document text
    • http://gelufose.scienceontheweb.net/vunujamibisiner.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/30276226148.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/american_football_games.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/zajabeborimufaxolelok.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_a65d8b3e9992492db49348abb2bdc8a4.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_5d98e791cb8d412493f69f2d3cf928fd.pdf?index=trueIn 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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 5448 bytes
SHA-256: bf2978dde169c0e76b44d5a851b9b08147e1091e2af5cf79e765d0bf4c747303
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 11292 bytes
SHA-256: 5c2d298898a4e81f96625046f3f10c295a4001feab9184aa40e750133290ac65

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