Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a5ea69e4fcaf32…

MALICIOUS

PDF

62.6 KB Created: 2020-06-12 19:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54ed46a006e74165aaef488cbbdb55ec SHA-1: c5aa173b90abbb517e8cb6b709501be98e25d0f7 SHA-256: 09a5ea69e4fcaf329e003e03f1f3fcb9693ecf148d2bd6601304af9993c9b580
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by an ML classifier as malicious and contains a large number of external links, many of which point to other PDF files. The primary function appears to be acting as a link farm, potentially for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect the user to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://mx.nadiasalomon.com/uploads/1/3/0/2/130289278/130289278.html#5e+modeli+matematik+ders+plan%25C4%25B1+%25C3%25B6rne%25C4%259F
    • http://smtp1.lessoeurcieres.com/uploads/1/3/1/3/131383823/7818322.pdf
    • http://accelerationdays.com/uploads/1/3/1/4/131452733/fizosamajuwulijozupo.pdf
    • http://globalbridgelinkservices.com/uploads/1/3/0/3/130313539/8245973.pdf
    • http://c60madeinusa.com/uploads/1/3/0/5/130590105/886b596a43194.pdf
    • http://maddislascecooks.com/uploads/1/3/1/8/131856134/cdcef83277.pdf
    • http://adlithium.asia/uploads/1/3/0/6/130621801/kixodapupo.pdf
    • http://poddiction.com/uploads/1/3/1/6/131637209/bbdf03066a205d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://mevowavam.files.wordpress.com/2020/06/43051925933.pdf
    • https://buwivimew.files.wordpress.com/2020/06/sikevowafiperupomizinuri.pdf
    • https://larusepami.files.wordpress.com/2020/06/jewodasazuxub.pdf
    • https://sagunukepeg.files.wordpress.com/2020/06/sutazobo.pdf
    • https://jidiluda.files.wordpress.com/2020/06/lumutejezamuzokanom.pdf
    • https://tivujoz.files.wordpress.com/2020/06/34887734991.pdf
    • https://lazatojifu.files.wordpress.com/2020/06/zoxamaxirivamifovun.pdf
    • https://gutagaperub.files.wordpress.com/2020/06/davowesavapijononamega.pdf
    • https://kitafolek.files.wordpress.com/2020/06/ramorutuxoxituxegifoweb.pdf
    • https://toruxot.files.wordpress.com/2020/06/ruxufinosidadasov.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac07.bin
3e762ecc29297e79063720ad2ff62a9fb8a99f47b4b1723b2862457979b2bf5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC07 13788 bytes
font_01_sfnt_off0000d6a9.bin
4fe94d0d01e3fc85851e78d971ea394167cca9f5539491c06b64ba9eee8df098
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 16140 bytes