Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c71abb38b813c4…

MALICIOUS

PDF

39.5 KB Created: 2020-11-09 08:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ef0978c85feadda74af5960896e2ef5a SHA-1: d08a8bc08ce65dc9d3ed113bd354803ccf9272bb SHA-256: 11c71abb38b813c41ac9ad502485c224b2e4d61994235abeb4ff7532aef5507b
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://traffset.ru/123?keyword=lg+-+27uk600-w+review PDF link annotation
    • https://befakudi.weebly.com/uploads/1/3/4/5/134595811/7a8360cb627890.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/noratuwiti.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/vinaruzipetaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5f9e790ce2d93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_5fa4cd13b3da0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://radofet.files.wordpress.com/2020/11/gijomilagulu.pdfIn PDF document text
    • https://nawazuled.files.wordpress.com/2020/11/duxavavosukenavuloze.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdfIn PDF document text
    • https://gogajajar.files.wordpress.com/2020/11/48539197016.pdfIn PDF document text
    • https://dunefufurux.files.wordpress.com/2020/11/formation_auto_hypnose_gratuite.pdfIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59F8 5132 bytes
SHA-256: b22335630cea3bf4b7a0e3dbb8b0adb298172afbaaebbe4a25cc8e8875389e8e
font_01_sfnt_off00006bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBA 11240 bytes
SHA-256: 6865af5797653d14d373e91ab166792d963684ba55e63168a49cd237359b1f71

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