Malicious PDF — malware analysis report

Static analysis result for SHA-256 528012aa2351ed9d…

MALICIOUS

PDF

69.0 KB Created: 2021-03-03 20:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c1ea3278130bccd52dc886dba3589960 SHA-1: bcce371a419ac21be08a92e00a86f62445bf6839 SHA-256: 528012aa2351ed9d87fe29f9c7a7e744baebbbe462b679d66a9db4172c252ffd
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to a compromised or malicious site.

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
  • 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/strik?utm_term=natops+instrument+flight+manual PDF link annotation
    • http://pekibexuvipeve.scienceontheweb.net/niwesukifa.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/hbhgpO1/95151229003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5fe104dc5e6ea.pdfIn PDF document text
    • https://cdn.sqhk.co/vutabopi/hegchgj/jodovuwamiwiwukivoto.pdfIn PDF document text
    • http://weareanonymous.org/ink_tattoo_drawing_coloring_tattoo_makerspdg8l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5ff1beb69ede7.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/jhbrkAn/binozelixewofebelidoliro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480173/normal_6033ed4d09d3f.pdfIn PDF document text
    • http://italy50wow.pro/34271792153nlt3u.pdfIn PDF document text
    • http://nidikasuzarola.iblogger.org/gijigal.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/56675670738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_602b7023f3e7c.pdfIn PDF document text
    • http://bilapak.66ghz.com/votikakokigoketunedofa.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/fakugof.pdfIn PDF document text
    • https://cdn.sqhk.co/metumolalub/Mi1heji/retosigugebubavika.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/nalifij/books_on_social_media_marketing.pdfIn PDF document text
    • http://semevalidenod.rf.gd/99705691652.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/bosepaxatonufowafoko.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_off0000d258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD258 5284 bytes
SHA-256: 3967e5c26eb0ab1725e34479d9c459b284a74f097ea5b0c7bb003357b7186f64
font_01_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 10044 bytes
SHA-256: b2bcefe5ee03f59bf4283950dc89da0175a3bd054749d687ee3208503926d7dd

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