Malicious PDF — malware analysis report

Static analysis result for SHA-256 25511f395bb7f4dd…

MALICIOUS

PDF

82.9 KB Created: 2021-03-21 06:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 53a887d89640794ed6e2ce402a7b94af SHA-1: c93218cc5446d511b9a81fffe302d27151c8c68c SHA-256: 25511f395bb7f4dd7078982e21e1bd36402c0e9ba5f89f7f9afe7e4f3e1cf950
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for malicious redirector links and a high ML score, indicating malicious intent. The embedded links, such as 'https://crophysi.ru/wix?keyword=scrum+planning+poker+cards+pdf', are designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://crophysi.ru/wix?keyword=scrum+planning+poker+cards+pdf In PDF document text
    • http://vostokzapad.su/784610243132w6li.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/gdBMjb6/zovixigilafefexotopib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403428/normal_5ff53fdd7fec5.pdfIn PDF document text
    • http://huseyincanx.com/chevrolet_traverse_2010_manualdo2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_600c7711bfdde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5fe337bb0ff43.pdfIn PDF document text
    • https://cdn.sqhk.co/zodunoxurob/fidjfsT/ronaldo_insane_free_kick.pdfIn PDF document text
    • http://50offit.pro/financial_report_orangemc4kp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fe64bda4be3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_602cf2ec6ec03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449184/normal_5ff0e869db627.pdfIn PDF document text
    • http://fbdirect.site/lalerulx7i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_6035343c8119f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_6050414a6ce7f.pdfIn PDF document text
    • http://smeh-mif.space/drawing_tutorial_mangabcw7a.pdfIn PDF document text
    • http://astrohelp.space/hp_laserjet_pro_400_m401dne_micr_toner75rxv.pdfIn PDF document text
    • http://trellos.fun/metal_slug_5_character_selectekaxo.pdfIn PDF document text
    • http://reznitskygallery.com/82332324750fvhex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_60559ac8e256b.pdfIn PDF document text
    • http://bitcoinov.site/what_is_the_best_zombie_survival_gameaeowx.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/369f89c7-6d36-48bf-a8ed-4c25f59c6dc6/how_much_money_does_an_aviation_operations_specialist_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48730df7-1a1a-4dd1-a087-cf1c09f5b057/que_pasa_cuando_tienes_una_linea_negra_en_la_ua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5539d357-4522-4db2-bd0d-63cefe66ed70/zmodo_how_to_set_up.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_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 5640 bytes
SHA-256: d150a9072aaf9b98b8be8d6db613f1b4eb10c1937f64189ca3034b138ae4c76b
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 22116 bytes
SHA-256: 5835eab1769a90d28b86c08db6fd01fd4f4530de1677b2939eab143112299acf