Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b9a0a39425bd0b…

MALICIOUS

PDF

70.2 KB Created: 2020-11-10 05:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e7cf1342b302a768a94e85c207732a26 SHA-1: 2786f8fb6a550e172f615f0b2d758f572d400b95 SHA-256: f6b9a0a39425bd0b7281b7afad74a4b7066f05f4302ece2ade9676c087b97901
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 0.9997

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://trafffe.ru/strik?keyword=subaru+outback+manual+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f88ece0c6cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5fa62c679c61f.pdfIn PDF document text
    • https://damapedev.weebly.com/uploads/1/3/4/5/134576203/kigekureberali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_5f9d880c61c84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f9fe6d9bdd88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f9fa2be7e4e6.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/6628674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fa873ad50e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_5f8d0cbc182e5.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/mateferorip-kunagimoxe.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/guxosa/red_lantern_oath_animated_series.pdfIn PDF document text
    • https://s3.amazonaws.com/sanekufiwumafo/irrigation_license_texas_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/90334711274.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_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 5556 bytes
SHA-256: 79a0e00dcf0b806534132528a0eadf0f1d2fa6f6f493c041eed65e06a1cfb913
font_01_sfnt_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 10788 bytes
SHA-256: a55e961186b3efd454c4efdd02203cb6c9fbfa35406109e29a02362117fda33e