Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5a20c865cdcc65…

MALICIOUS

PDF

67.9 KB Created: 2020-12-19 02:27:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b5ebcc81c92e039242425e4cc4f3a6 SHA-1: 7aa7a1faaecfad479f902ccedaadcc28a46e28b6 SHA-256: 3d5a20c865cdcc650bb039b574537e906a0800aee7375879abb0d613797c6c3e
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious phishing document, specifically designed to lure users to a link farm. The embedded URL `https://trafftec.ru/strik?utm_term=christ+hospital+chicago+medical+records` suggests a pretext of providing medical records to entice clicks. While no scripts were directly extracted, the PDF structure and external link farm heuristic strongly suggest malicious intent, likely involving JavaScript execution to redirect the user.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=christ+hospital+chicago+medical+records
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/jebupidaxipisov.pdf
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/gowokefisoxenu_nigirozufekagok_wenujojuxas.pdf
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/8675744.pdf
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fcb153b3aab3.pdf
    • https://cdn-cms.f-static.net/uploads/4401694/normal_5fa5bfda9b6d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2c1143d9-e6d5-4ec7-8ecb-69144e5367d3/79286066710.pdf
    • https://uploads.strikinglycdn.com/files/a7caf155-8cd0-4768-ad28-aebd665d416a/cumanda_for_lyme_disease.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf1d7edabee7b44065e44/1606218200825/lizesurapidaxomama.pdf
    • https://static1.squarespace.com/static/5fc695a917e720264011615a/t/5fc7be065060c93fcd897ede/1606925833038/21037328245.pdf
    • https://static1.squarespace.com/static/5fc28eaf9698b02c7f2b2aca/t/5fc9b8c1be6684539de8c400/1607055554353/las_vegas_national_park_weather.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd01056a371610b8780aab/1606222086168/4146849352.pdf
    • https://static1.squarespace.com/static/5fbfceb2c14dfd36feeb11ef/t/5fc5ce3b3c6ccf69f3286ee5/1606798909390/pesano.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_off0000cccd.bin
0e5c99ce7a9c5a09d9bd75189f55ee53fbf5d78cedc1679c6642c546007d9222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 5392 bytes
font_01_sfnt_off0000dee9.bin
65461f183d57535aead8b553549eab20c3d11c7832ed29f65e38dfbb7d6ba3b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 10588 bytes

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