Malicious PDF — malware analysis report

Static analysis result for SHA-256 6717730d33aaa6ec…

MALICIOUS

PDF

77.6 KB Created: 2021-01-17 07:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f6f5675f51a12524c600f8c8b804b330 SHA-1: eed7d46ad998ef8c52c1852c5383ef1eefa235ce SHA-256: 6717730d33aaa6ec6be28e776d5d23eeff4b42cffe3ed2c406c34d8a015844f2
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a high ML score for maliciousness, corroborated by ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, appears to contain text related to medical treatments, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=methylprednisolone+vs+hydrocortisone+in+asthma PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490752/normal_5fd65b05c8a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5fa769b717475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_5f9e4164a92de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5fa8a45bc640a.pdfIn PDF document text
    • https://site-1173987.mozfiles.com/files/1173987/31325690227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_5fdc2cdf60574.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/feliso/chap_chap_charkha_chale_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/47932393169.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/figukudufokux.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/31198919254.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/23653556352.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_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 5480 bytes
SHA-256: 74d17941041d3b81dfd4e94527ba454b785383adab8650c62056eea13c609c9b
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 10724 bytes
SHA-256: bb254be6a9c451f3f0bba5927c44e4058558ee74685c198f69b6205583ede155

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