Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83bd4d74106c68c…

MALICIOUS

PDF

136.7 KB Created: 2021-01-08 19:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4829d8ef2892727bab039e1f9c85d7a0 SHA-1: 730966801603238316c565d5b736a72ab3a76401 SHA-256: b83bd4d74106c68c0f5b97cf590ff39926d09f6b19f2abd1d591ea99801b8dcf
96 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, 'https://trafffe.ru/aws?utm_term=bourbaki+analysis+pdf', is flagged as suspicious. While no scripts were directly extracted, the presence of numerous links suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://trafffe.ru/aws?utm_term=bourbaki+analysis+pdf PDF link annotation
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/pagabasijepulesetiga.pdfIn PDF document text
    • https://pulipelese.weebly.com/uploads/1/3/4/6/134686308/3408320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5fd765c0500b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f90668ddf834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bivanud/keresararufitu.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/73970291265.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/90937739644.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/5318961462.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/50707409375.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/gomelajuxanabagodorux.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4E4 5392 bytes
SHA-256: 06d5e9086e3616878706803fde3788ec12489a9a7f36fa7f1f0093e5f046d5d2
font_01_sfnt_off0001d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D751 12892 bytes
SHA-256: 82f580f7cfa6c6993abdbc9b4169af5bb5dfb2aba3140ad0d054e58dff112c83
font_02_sfnt_off0002000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2000C 16376 bytes
SHA-256: eaa711f212ce34ae236e951ad3ba4f58dbb70cfedeae193d853f75f86cf4de3f