Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c7cf538b82ac7d…

MALICIOUS

PDF

68.6 KB Created: 2020-11-29 08:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 54dd2feb45532c84fdaf72c32cc1aed0 SHA-1: dfc0e91be68647063e8f760902bf2f67ccbd494a SHA-256: f8c7cf538b82ac7d549793021ec931fc64f56163f3fb947800ff59b2f2cabf13
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 0.9998

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://traffking.ru/strik?utm_term=cdc+zombie+manual PDF link annotation
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/wovexotepevop_xodol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_5fa20c4cd7b3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8aab9a603bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_5f95ad0235f6c.pdfIn PDF document text
    • https://mixekolasum.weebly.com/uploads/1/3/4/3/134388380/722c8e94f2e.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/096fc46624a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456667/normal_5fa3bc0a66319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5f9b5439d968e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_5fa0f6eaca8c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_5fac09f831464.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/henghuili-files2/bare_necessities_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/kimowumuv.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_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 4908 bytes
SHA-256: 13feee47f01db9007a6b71cc158aded3b1b388f21efba191237bdcab8e315313
font_01_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 10588 bytes
SHA-256: a48efe4ef10ab69f9f335ef7e57d712de9572b13b6b47dd219ee959127d95aed