Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedcdf130c2034e3…

MALICIOUS

PDF

46.6 KB Created: 2020-11-06 21:31:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 601e24f5c654dcf3c8ca72ee098d36ab SHA-1: 909a5f9477d247bb848e5b921b29323406a79e47 SHA-256: dedcdf130c2034e3ff0cacefeabb133bbdf8b0a64a4c98a659401cbfa417cf35
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 4

  • 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.
  • 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://trafffi.ru/123?keyword=rilke+orpheus+eurydice+hermes+in+german PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5fa43c7a87fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_5f9a790311d56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413570/normal_5f988e589a81a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f87038d8c4d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fa099fc4f1e2.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
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023f783d-1e82-4142-a3d9-bfa164975389/vakazubof.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/sanjay_agarwal_costing_book_ca_final.pdfIn PDF document text
    • https://towafafu.files.wordpress.com/2020/11/lorosikedudikofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5f658c-b205-4aba-a185-6e3d6243bf90/magical_crops_gem_socket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c2c223-e59b-49ad-b21d-7bb133fb37d9/sanubiv.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/gimogasuweximosufok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60b571a-a81b-4a70-90b5-b63453cf1e7e/88846754311.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e70258c-3654-400b-88ba-8b56cb0d7e9b/83006144561.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6690 5464 bytes
SHA-256: edb69fb552409d526317c3f19f2ce2581b9d8c324a42481cbd499ed26fc57096
font_01_sfnt_off000078f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78F1 11752 bytes
SHA-256: e475defb5ccd8720ed7b61a21bf3f515fe539ae367e849f39106e98487c2c621
font_02_sfnt_off00009f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F4F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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