Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f9c03a3b143f96…

MALICIOUS

PDF

76.1 KB Created: 2021-01-27 01:34:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9624311fd99501b6f7d186ac1caa40d9 SHA-1: 1028ce7b953f8ce92be24740a9c8d52189e3f161 SHA-256: b9f9c03a3b143f966f9032c93ba6662a6300f93fd75352fafea9f4a74d03be75
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to domains that appear to be part of a link farm. The document's content, though heavily obfuscated, suggests it is disguised as academic notes to encourage users to click on these links. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports the link farm and potential phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=data+communication+and+networking+pdf+notes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5fe470dbc91d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_5fdba37a4ee2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5ff9a7cbe4a06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485578/normal_5fc8ff009efed.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/Jggriew/37388756883.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/7434735.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/0e864c60.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/ashddzz/free_things_on_your_birthday_arizona.pdfIn PDF document text
    • https://cdn.sqhk.co/vosizijanad/f5EaihQ/65432143577.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/5jvaijA/articulos_de_reposteria_cerca_de_mi.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/donarepemi/85314150846.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/gce_o_level_chinese_2012_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/fuzixitijodapofi.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/kekefamabowululomigejetip.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/love_is_you_chrisette_michele_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/professional_cv_format_for_marketing_executive.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/zubiwinesopukamugarekiki.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_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 5596 bytes
SHA-256: 122645f4af4dc692ad0c947d13114561d92b1363ba5139edb87ed9626f981508
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 10664 bytes
SHA-256: 10f61e9c70a52c5143cd9ed3ad0b5e8b1ef9fc1e0a8cbf9589435da9cc372d95

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