Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f97f547a8074e88…

MALICIOUS

PDF

45.2 KB Created: 2020-03-25 08:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0283e52db21c3afcc6a97baf409f1854 SHA-1: fe894729d762833b5fd97314824c36d557d9e204 SHA-256: 0f97f547a8074e88f18d7e6eace3373b54b12c155e47a6422c50da5aac06bb6d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains a title related to music, but the primary function appears to be directing users to a network of linked content, likely for SEO spam or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://mccorkleagsales.com/uploads/1/3/0/7/130775972/130775972.html#musica+de+jarana+yucateca+el+torito+para+descargar
    • http://londonandonxy.club/uploads/1/3/0/5/130588751/3577400.pdf
    • http://littlehoneyfarm.com/uploads/1/3/0/5/130539205/tasezilefodedenop.pdf
    • http://psychiaterinwageningen.com/uploads/1/3/0/2/130289461/pamowenemusotudiga.pdf
    • http://silviaprestes.com/uploads/1/3/0/7/130775370/vepep.pdf
    • http://starsfinejewelryme.com/uploads/1/3/0/5/130551366/5422344.pdf
    • http://msllv.net/uploads/1/3/0/3/130379115/vororuxogumo.pdf
    • http://admin.seaviewstorage.co.uk/uploads/1/3/0/8/130874011/b4caac72.pdf
    • http://www.kendrickfitness.com/uploads/1/3/0/2/130272500/xafodiziw.pdf
    • http://ciberpen.com/uploads/1/3/0/4/130478551/vavugikiwuwosuxaf.pdf
    • http://bestbrand2020.site/uploads/1/3/0/5/130550724/nitaputo-ditetawebit.pdf
    • http://sunvalleyappliancerepair.net/uploads/1/3/0/5/130539912/fofukakabalefoja.pdf
    • http://atlgreenhouse.com/uploads/1/3/0/7/130776341/3386843.pdf
    • http://taggroup.nz/uploads/1/3/0/3/130379294/faven.pdf
    • http://thejoyceapp.com/uploads/1/3/0/3/130323559/5834548.pdf
    • http://bishopglen.com/uploads/1/3/0/7/130740050/9256654.pdf
    • http://andweber.com/uploads/1/3/0/7/130776617/3505074.pdf
    • http://svnforce.com/uploads/1/3/0/7/130775485/wurimabetubu.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://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_off00006edf.bin
6a90bef7a47b8fdc59b70cc3616fc60b108c47b0bafe972b650cc14bd02fd6b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDF 9312 bytes
font_01_sfnt_off00009055.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9055 16036 bytes

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