Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eff3029888bb73b…

MALICIOUS

PDF

39.7 KB Created: 2020-11-07 07:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a39ced8cef20cbda6c3e429165678148 SHA-1: 19c8decd9e01a5f28f93d98d45a0714096698650 SHA-256: 8eff3029888bb73b2bda52abbf9027fd67ba2e37ef5aa661725ed1186dfd37dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffine.ru/123?keyword=unidad+2+leccion+1+gramatica+a+answers+key PDF link annotation
    • https://laxomubidaxudov.weebly.com/uploads/1/3/4/4/134475580/ribixirarok.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/fefew.pdfIn PDF document text
    • https://suvojenedixu.weebly.com/uploads/1/3/4/3/134354738/muvosemoxitoku_zajagefola_kowifibovido_pakarebefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f991261db7f0.pdfIn PDF document text
    • https://gekitudijelal.weebly.com/uploads/1/3/4/2/134265938/56a88a6452406c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469128/normal_5fa6105b9f7a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449987/normal_5f9f93ea41015.pdfIn PDF document text
    • https://gekilatati.weebly.com/uploads/1/3/4/3/134378061/fulavel-rexivedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f873a4f603dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_5f9b125810757.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/kisimujuk/62744283580.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/applied_physics_ak_jha_download.pdfIn PDF document text
    • https://givolajokofe.files.wordpress.com/2020/11/japatewajaliwififu.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_off0000580a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x580A 5692 bytes
SHA-256: b85c58d15bd8db57198105b9b272ed6b51c15b52780af0867259468339a16891
font_01_sfnt_off00006b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B79 11476 bytes
SHA-256: c00d6e5b3e9e9c636db192286d1d1556eb18de978adfadf38d2e146e22251bce

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