Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0d87a8b8ba311c…

MALICIOUS

PDF

69.6 KB Created: 2021-02-28 22:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 356ad29e5a697d9698a997403b9bac5f SHA-1: 943aedc7f626f5d7adec44888faa2c05d7cdcdf2 SHA-256: da0d87a8b8ba311c867d3e15d1f661aa9831d1d4a130574a0903bd030d537c70
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=dog+tuxedo+bow+tie PDF link annotation
    • https://zewurutivuzaned.weebly.com/uploads/1/3/4/8/134888434/bc675324b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_600a05c02bf74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_5fdd45831edda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_6018d82b3c4b0.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/jehfgcX/40740084970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5fe1339c190b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_601b38733ebf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410201/normal_5fcf0c09ec190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372100/normal_5ff7f58f8eab7.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/M6hhgcM/jawag.pdfIn PDF document text
    • http://rankingcoach-seo.com/dibudexikenobulirumowoboh5h76.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/igPHqjd/land_rover_defender_90_for_sale_craigslist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_6034c2f47e479.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/fumiposamisur/32805921752.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/dream_league_2019_barcelona_kaleci_formas.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/42677979556.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_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 4776 bytes
SHA-256: 6d9fdcd13c2db4be5f0c1c7471e13e6039977692ca98bafe39e64a40606c29b7
font_01_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 10236 bytes
SHA-256: a7628dcd3a24a0abd9b44b66bfdecd64a84c8c6bea5e5aee4bde9b1220f8088b

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