Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5396de7608e553f…

MALICIOUS

PDF

32.5 KB Created: 2020-04-14 15:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 02abc99ed06ea4a1c05d8723390735ef SHA-1: 6d3be679033bd19cc8889d3ee7963b08b57b2f9e SHA-256: c5396de7608e553f1d423a82c0c3aeb9e42a8ab64672f59acf05196882b208c8
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of external links, a technique often used for SEO poisoning or to distribute further malicious content. The document body suggests a lure related to educational material, specifically a 'Precalculus review sheet pdf'. The presence of the PDF_SEO_LINK_FARM heuristic firing strongly indicates a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 3

  • 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
  • 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://thesoonernetwork.com/uploads/1/3/0/5/130551607/130551607.html#precalculus+review+sheet+pdf
    • http://apdesignsdc.com/uploads/1/3/0/6/130621620/2189965.pdf
    • http://mayancateringftcollins.com/uploads/1/3/0/4/130488773/xumogosudetuk.pdf
    • http://juvyventura.com/uploads/1/3/0/5/130588843/lalumubi_desofox_noxoku.pdf
    • http://fundraisingwithtees.com/uploads/1/3/1/0/131070434/ce212.pdf
    • http://bygollycandlesnmore.com/uploads/1/3/0/4/130483295/a741497d0.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005653.bin
85d525fd7146b2aceefb349377aa6688ce829ea3a93eecff24e86fc81e50ab7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5653 8388 bytes

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