Malicious PDF — malware analysis report

Static analysis result for SHA-256 98427d909b82956b…

MALICIOUS

PDF

76.5 KB Created: 2020-12-14 19:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83e9f7903718dbe54a9aea6cf3ab8af5 SHA-1: 17522fabd5b82bd5c593a8ba5c9c139946f9cc87 SHA-256: 98427d909b82956bc69d0180cd786fd82855d06d81ad7c2a684ee9ecc03ada79
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=carl+dean+switzer+age
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/basuzepipulojim.pdf
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fa7a79193a10.pdf
    • https://cdn-cms.f-static.net/uploads/4490001/normal_5fd5f892a9cdd.pdf
    • https://cdn-cms.f-static.net/uploads/4416316/normal_5f9bdb7f5e00f.pdf
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5f9f09598c200.pdf
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fc164419ebe8.pdf
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f9665c5ce2cb.pdf
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f97e249a1733.pdf
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f87839513e75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbceee068bfc5186166699a/1606217441658/bmw_garage_door_reset.pdf
    • https://s3.amazonaws.com/wilugugo/convert_to_amazon_kindle_format_online.pdf
    • https://static1.squarespace.com/static/5fc2d8a416f6d44b07cb59c1/t/5fc5d7d43f75b166439eb9c3/1606801367787/stock_market_technical_analysis_hindi.pdf
    • https://s3.amazonaws.com/mamibis/preparation_of_ferrous_ammonium_sulphate.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6f.bin
6f5000648f50db59859a1433de99f25de77627cf4fb1905cc21eb1c37e8dd04a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 5040 bytes
font_01_sfnt_off0000ffb6.bin
006d743ce525903735ed3bae4dd6194485f691de0384fd97f5d50dc610ac148c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 11264 bytes