Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d96471ab521423f…

MALICIOUS

PDF

73.6 KB Created: 2021-03-04 09:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 71c3f76bf1e5671212f0eb2d772234f0 SHA-1: cae9dc0609a8ee2b0a82f883b65823c3945d128f SHA-256: 5d96471ab521423fb2d57eb87e5fda257e0baa6055350055dd5a4ad6b58c6478
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, including one that mimics a search result for 'where to buy xbox controller' on a disposable domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFException. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vilenefex.ru/award?keyword=where+to+buy+xbox+controller PDF link annotation
    • https://mowerezudajam.weebly.com/uploads/1/3/5/9/135966589/5502696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_600cfece3ef81.pdfIn PDF document text
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/ec2ed68a3ece93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_60240102d3c89.pdfIn PDF document text
    • https://nexevakef.weebly.com/uploads/1/3/5/3/135327015/fuvibasa.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/how_much_is_kristian_alfonso_worth.pdfIn PDF document text
    • https://ferijadupegol.weebly.com/uploads/1/3/4/7/134705138/mekox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_60143c141a45e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448535/normal_6006b36078faf.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/gozifep/wysiwyg_website_builder_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/padoxejapexotunuxobi.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/macbook_pro_user_guide_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/62616291707.pdfIn 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_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 4820 bytes
SHA-256: ee58c8b6addf17c6c1e228505ab45b99a55a806f4d5d42f3aeb66ca0321031fc
font_01_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 10164 bytes
SHA-256: 3b7788d3aaf4cf7b3b848a97b70bdd8f05bd6a97acac4dba3201cc8146db5e23