Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d83ba84fddcd045…

MALICIOUS

PDF

40.0 KB Created: 2020-11-08 16:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 63807160a451202a7ef864806d475fa5 SHA-1: de012d2f4ddd83910972c4ff9de75685225e23df SHA-256: 7d83ba84fddcd04514a0b64e098065c3cc480d3ceaae23dd3299e03ec2e4872f
66 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 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://traffnew.ru/123?keyword=awesome+memes+images PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f960f43008e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f8c96bd1e85c.pdfIn PDF document text
    • https://gozuneputir.weebly.com/uploads/1/3/4/3/134345179/829746.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/ralexuf.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/zemijodanivug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5fa68767d4e0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_5f9d87302dd68.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/xizowapewipilaxat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_5fa54469b1326.pdfIn PDF document text
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/61bbc46a3b5c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fefitaw.files.wordpress.com/2020/11/64939725781.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/fipozexula.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://lowipaded.files.wordpress.com/2020/11/59314446198.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_off00005ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFE 4956 bytes
SHA-256: d777f321b791e6bffa81317854a3e85f8f869659dba4819ff0ea6b7139452d5a
font_01_sfnt_off000070e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E0 10180 bytes
SHA-256: 9eaabd124568100cc02c72556205ea074b0002052ca40e643885d6bfcacd0158

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