Malicious PDF — malware analysis report

Static analysis result for SHA-256 564b554d904b43e9…

MALICIOUS

PDF

59.4 KB Created: 2020-12-02 16:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: db2aadb41cba35a83ad7ce0d474bd763 SHA-1: 20672ae01eb0bf72867dd08caa4efd106b897c6f SHA-256: 564b554d904b43e9f97a1e6e4e171c63aa8060df90a40c323473810266cd46a9
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=happy+wheels+a10 PDF link annotation
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/1383121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f9a374b58aa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5fa789c192ba8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6a259b1ed03538d372a7/1606380071565/59014045250.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/zumut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/593a42c5-4231-4771-a23d-751381be94f8/peticiones_para_misa_de_niC3B1os_en_adviento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1f1473-c93e-412d-bdee-57338f1b5dcc/wevekadudisexivu.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/vietnam_a_television_history_episode_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e986122-5d2a-4a51-95f1-478f78f8f3b9/xumozokinew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0028ac14dfd36feec75cc/t/5fc1714118e72e5fdb0e0ef6/1606512961421/63065402589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1275aedb-cd29-44c5-9351-3a03053576af/gojodokodafube.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_off0000aed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED1 5160 bytes
SHA-256: 7e9a08226c1d581ba3d1ee0e2c9b7d502d3b2e2cf9b17b23843d5ee9dffced33
font_01_sfnt_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 9628 bytes
SHA-256: a85fab7b53dd85a2b6b30e86b6c7b703d350826f4537f4ad17ff23a81b90368f