Malicious PDF — malware analysis report

Static analysis result for SHA-256 778b13ae08d41430…

MALICIOUS

PDF

76.8 KB Created: 2021-04-02 02:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 437c0e2eb022c0f1c5bd176fb70741d8 SHA-1: 30dc9700becb1a2abf96512f38d66949d25d284a SHA-256: 778b13ae08d414304a2baa1f89374247acdf2f254e14a86c5317e7f95e834434
186 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, directing users to various websites under the guise of search results. The primary URL, 'https://kuzutuzo.ru/award?keyword=que+es+la+equidad+de+genero+en+mexico+pdf', suggests a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

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://kuzutuzo.ru/award?keyword=que+es+la+equidad+de+genero+en+mexico+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4527345/normal_602cda73543db.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/xijiti.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/2008_lamborghini_gallardo_spyder_hp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5ffc0a6e51213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_6050d4053b870.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465930/normal_5ff33a22662af.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/motorola_apx_6000xe_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_60011e217f734.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/does_gamestop_sell_nintendo_ds_chargers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_6022595e76c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_604029946f5d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_60419b4861610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490250/normal_6032bee3e1762.pdfIn PDF document text
    • https://lesoloruvurer.weebly.com/uploads/1/3/6/0/136028926/koloxeriwojubomip.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/d42f7f99-2047-4cde-92a8-0fc0f7208e55/calendario_escolar_2018_y_2019_sep_jalisco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b701a12-5798-4fd0-bfe4-77f6db3d5a7a/mc9090_hard_reset_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54452c0-1f25-444d-9cfe-43d2528f6b06/how_to_do_call_forwarding_in_airtel.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_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 5732 bytes
SHA-256: 51da3827bb747cc039ddc7f02a03bcdec76ecd653bca3fffb28b880bb1a2fbdd
font_01_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 11588 bytes
SHA-256: d57d9d7245bee0607692923c5e6991d7228caa443cadc5e1c6e65c81ace34098

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