Malicious PDF — malware analysis report

Static analysis result for SHA-256 56668c68b3caae32…

MALICIOUS

PDF

73.8 KB Created: 2021-03-15 18:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4a3d11e78edbf320b293d4566a5fee34 SHA-1: 128068fe498e463e235b059c793b819fc213d492 SHA-256: 56668c68b3caae3272950aa4addea4b48378571ed9435909bc40079ffcd4ae56
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 0.9998

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://seumenha.ru/123?utm_term=microsoft.+net+framework+2.+0+installer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd679a63a880.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/305dfc71b2.pdfIn PDF document text
    • https://ronikirene.weebly.com/uploads/1/3/5/3/135393313/diriketen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500201/normal_6020bf08e20a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fc5706e2c667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_601e4af5b8a1b.pdfIn PDF document text
    • https://balevogikuvapij.weebly.com/uploads/1/3/5/3/135333961/5222011.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/ruger_mini_14_scout_scope_mount.pdfIn PDF document text
    • https://sinofokum.weebly.com/uploads/1/3/5/3/135316266/9573584.pdfIn PDF document text
    • http://takovevagagiv.scienceontheweb.net/snow_like_ashes_meira_and_theron.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451217/normal_601f5974ee617.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/rixepadafetosamiwozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_60153211a23c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://demuxijobaj.epizy.com/42946007631.pdfIn PDF document text
    • http://lagiwafumize.rf.gd/vocabulary_builder_activity_ancient_egypt_and_kush_a._content_vocabulary.pdfIn PDF document text
    • http://vovajixavago.epizy.com/osho_book_of_secrets_review.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_7ea4b6ef0e17449e83383376a5a21404.pdf?index=trueIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_07d4b08281644888923978d4fc84eda7.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_f68e38931d874365829de26de1ef6668.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 5284 bytes
SHA-256: 0e0dca697dbef7f54315333dcba7024ae7cba69230345d7ac10f24959220c9e0
font_01_sfnt_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 10068 bytes
SHA-256: 8320264dda805985f0b15454df09d3767baffc5710b89884cc0f128a8d0cfbab
font_02_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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