Malicious PDF — malware analysis report

Static analysis result for SHA-256 badde870f4fa6435…

MALICIOUS

PDF

82.2 KB Created: 2021-02-23 07:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb0695e6351dd1efd1ecd41206ef5638 SHA-1: 7e82ec49ba0f265520ecde7d8ba79361793e834f SHA-256: badde870f4fa64354b980b3454b632d5614f68ba70efb36a056efc7049aa5ef9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'jottigo.ru' and a query parameter suggesting a lure related to 'Les misérables songs'. Heuristics indicate this PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely a phishing or scam document. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=les+mis%25C3%25A9rables+songs
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/3768367.pdf
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5fe12003d1acf.pdf
    • https://repepojopojak.weebly.com/uploads/1/3/5/9/135970902/7a0808dd7a3fb.pdf
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5ff9b36db701f.pdf
    • http://doorstepcomputers.com/echo_gt_225_clutch_problemsohcmu.pdf
    • https://static.s123-cdn-static.com/uploads/4402000/normal_5fcb92a817b5f.pdf
    • https://cdn-cms.f-static.net/uploads/4477655/normal_60323494d9e1e.pdf
    • https://nefopebawobujo.weebly.com/uploads/1/3/4/3/134380481/8637847.pdf
    • http://krym.today/688743770566xpeh.pdf
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/diwovugubazemiro.pdf
    • http://testersairf.xyz/wuvubikejevilokemupevxhw6.pdf
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd5f616b835f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tosevud/wosidaziril.pdf
    • https://s3.amazonaws.com/kudowo/alesis_drum_kit_s.pdf
    • https://s3.amazonaws.com/pilazi/3372704899.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_off0000ff6c.bin
f6228a9fc0a69386c00f2feba6dadde2302956fd528d8ff60473a1db3d58c28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 5228 bytes
font_01_sfnt_off000110d7.bin
b50d1b94befefedbdd5fceddb1d8c27dfdb16bbb693694e8d6611d621124b56f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 13300 bytes

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