Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c12638290e7e589…

MALICIOUS

PDF

81.1 KB Created: 2021-03-11 14:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b162d93e1f7c7493594a0c5569083bee SHA-1: 4e360a0c6920b4e0e491670aae5716b526651bbd SHA-256: 0c12638290e7e58978ee7af2fb4eb6c3c618b716fc1295cf1c6e9eac503ccc14
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme for malicious purposes. ClamAV and ML classifiers identified the file as malicious, likely a phishing or trojan delivery mechanism. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=los+temperamentos+del+ser+humano+pdf PDF link annotation
    • http://max-lifting.store/karma_guide_probuildsjj92v.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/xagup-feloxadofujekaz-ligesuke-sijiterupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fd6688e6c71f.pdfIn PDF document text
    • http://evromotors.net/washington_department_of_licensing_report_of_salefr1pp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_6015bf884c324.pdfIn PDF document text
    • http://idealica-official-it.website/jugufulofuzow0vj9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_602afed83f904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fcbf594e49ff.pdfIn PDF document text
    • http://klyshsheff.xyz/fafejodatar1e8c6.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/148177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_600d81f7aee3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5fe42972d6466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387430/normal_5fdfb986244fd.pdfIn PDF document text
    • http://beamorem.com/cat_s_cradle_full_book6cao0.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/sulubowogeresorilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_600c48203af26.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/0032946d-64dd-41d5-ad22-7a4fa02d62bc/hush_hush_becca_fitzpatrick_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b36595-6f76-4f1b-9ef5-120bc44621a7/tapesabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae23c94-fa40-4534-b687-00a68372e6b1/xodarepurubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc22b273-bbf5-4d8a-a20e-4c11986d4d4f/surah_mulk_arabic_text_english_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f55526-a1f7-4be0-9f4d-a1fc66895134/94792319578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef42383-6bc2-4886-bbf4-6f98ac629f02/lexus_gx_460_for_sale.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_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 5220 bytes
SHA-256: 2745ee20ec61525278130859f69b5dfd2eed18f65d9d743cad819101f6f49e6e
font_01_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 10944 bytes
SHA-256: f1e01475d274e164bac40fa1f970f57b89c10956090afd9cd3c04bdac6ecb308