Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0216bca8ec940d4…

MALICIOUS

PDF

68.2 KB Created: 2020-11-30 22:25:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d32588a7ba1adbbd9e075cddf8e83398 SHA-1: 936b2611d2ea5b9dd49ee98d8ec9001914a69de8 SHA-256: a0216bca8ec940d4694ee676607cef03ab9d2d6345afa7d0f1e88f3073a23fee
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 0.9995

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 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://traffine.ru/strik?utm_term=letters+of+intent+for+teaching PDF link annotation
    • https://bugukafu.weebly.com/uploads/1/3/4/4/134490359/396121c5c.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/77c24ad3e119c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fab59e115c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_5f98c0a1c68d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8a06096317f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_5fa474996f017.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/3836fafd.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/9612681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb51fe7-4dc8-41f6-9dc1-42606b494eb7/the_sims_3_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc510905-c406-400a-a4c1-467095b57d8e/difference_between_dvi_and_vga.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_off0000d0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B8 5052 bytes
SHA-256: 60b507493b039d3e7cdc6e34163df81ec0257187760df3ed162eebacf083a9a4
font_01_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 10024 bytes
SHA-256: ce682f9d92a0538a8bfd8535cb8aa9ffe4d073dba131f8385e72e71905b33dc5