Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db312eae55d57ba…

MALICIOUS

PDF

74.3 KB Created: 2021-06-06 06:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bc549c4d5e9f192548313c70320efe70 SHA-1: 4debbc42e8b2ad34e63ea6880020d83dc959c715 SHA-256: 8db312eae55d57ba9e6bd178bf93e71b0cc7dd9fa521f865294ae2c6c2b61005
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites under the guise of providing a flexible working arrangements template. The presence of a large number of external links, many hosted on disposable domains, and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest it's designed for phishing or malware distribution.

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://leonvi.ru/123?utm_term=flexible+working+arrangements+nz+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472479/normal_6012e8e52942f.pdfIn PDF document text
    • https://zajoxewamabovi.weebly.com/uploads/1/3/7/5/137503144/be5e55cef.pdfIn PDF document text
    • https://gobalubige.weebly.com/uploads/1/3/5/3/135339343/tulefuvodopun-sugakatokizix-wutezosadusizid.pdfIn PDF document text
    • https://xeresitemuja.weebly.com/uploads/1/3/5/3/135311884/ec65421591ca402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_5fcc1fc5b7a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_60419c8960a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_6013c8981f56e.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/luvun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_60b9034c5567d.pdfIn PDF document text
    • https://wadozivapo.weebly.com/uploads/1/3/4/5/134512268/dafuz-bidag-sekeg.pdfIn PDF document text
    • https://gasibikame.weebly.com/uploads/1/3/2/8/132814219/8e21065ea8.pdfIn PDF document text
    • https://bakijowo.weebly.com/uploads/1/3/4/7/134726649/revofivuvonol.pdfIn PDF document text
    • https://famewuguwol.weebly.com/uploads/1/3/4/7/134700343/tebuzumatadoro-sibidabivedub-wawomosiror-bejekamizelanop.pdfIn PDF document text
    • https://zotolujirerezo.weebly.com/uploads/1/3/4/5/134582396/30ebfa.pdfIn PDF document text
    • https://petomikerip.weebly.com/uploads/1/3/2/3/132303099/jipelug.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/57efcbf9f74bf.pdfIn PDF document text
    • https://toxesuta.weebly.com/uploads/1/3/4/5/134510581/mibisosorimidovigon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 5508 bytes
SHA-256: 3b192f38cb36c63afb4b9fd478379fe6bd5f75404d48da5952b8ff18b6a00f9d
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 10448 bytes
SHA-256: 8c631cfe2a1c7b69ecb35a0f703ed735bec40f76fbb90ad838f12673a07c152c

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