Malicious PDF — malware analysis report

Static analysis result for SHA-256 2721b709d87d8d97…

MALICIOUS

PDF

44.1 KB Created: 2020-11-07 03:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3eb00c0def3ad504442f4e1ee90edba5 SHA-1: 11a1d3e8191e6dede8487c1f5deb35610c80b0e1 SHA-256: 2721b709d87d8d97e55b3cf0b21a3ad72cac7b475f492d74f2d8adaec7a42896
66 Risk Score

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 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=skateboard+games+unblocked+games PDF link annotation
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/3690619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f9da34c68b26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5fa51092203ac.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/nupow.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/9ecc6771f91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f87a71fc37b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8053cb0-3898-43b5-8989-296ea51b1ddb/bavipuzepezili.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/abecedario_coreano_completo.pdfIn PDF document text
    • https://tutitogigu.files.wordpress.com/2020/11/11656611734.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.pdfIn PDF document text
    • https://jizobote.files.wordpress.com/2020/11/jipirewe.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/vizedikofu.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_off00006c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2C 5568 bytes
SHA-256: f2ff0250bcd69aaf7e8db3e7ad61a6517eb8b3f4aaec074a44456f4bd91d5ed9
font_01_sfnt_off00007f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F06 10832 bytes
SHA-256: 7c5285aa8ffcea4d446c7ab91bb41a98a1f3a8d8f846bf4c40689523c2695be8