Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d65b69276494a0…

MALICIOUS

PDF

37.3 KB Created: 2020-06-21 07:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4ed575bc8f46716f6cf05943ffe9e14 SHA-1: 883c22290e83f17b479d6be5b15e6938aa7e1c78 SHA-256: f5d65b69276494a09faec1703cd5815f6953816706fd1c183f8afd2bfae4f52c
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body, though partially corrupted, indicates a lure related to 'Sources of nigerian law pdf'. This pattern is indicative of SEO spam or a link farm designed to distribute malicious content or phish users. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://receptordetox.com/uploads/1/3/0/3/130313582/130313582.html#sources+of+nigerian+law+pdf
    • http://thecollectionoftasty.com/uploads/1/3/0/6/130621002/rilugi.pdf
    • http://vantasselart.com/uploads/1/3/1/0/131070820/wimegebevirojada.pdf
    • http://typefourfilms.com/uploads/1/3/0/2/130289682/1237958.pdf
    • http://hostmaster.lalibelula.ch/uploads/1/3/0/5/130590432/8f2b48d5d2df6c.pdf
    • http://ellienicoledavis.com/uploads/1/3/2/6/132681229/kusureranamirave.pdf
    • http://helendear.org/uploads/1/3/0/4/130477829/3288840.pdf
    • http://wa.steel-line.com.au/uploads/1/3/0/8/130813953/bunufo.pdf
    • http://222-big-bon.site/uploads/1/3/0/7/130775245/wopelenaku-wekumaxogup.pdf
    • http://verdepalette.net/uploads/1/3/0/3/130323130/bomowokekanewedowopa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005516.bin
07fc427ed185ec5826a63ef206cae24033fe081c9bdc8451f51c0407ebe1fcc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5516 5320 bytes
font_01_sfnt_off00006739.bin
bd7c296b609a31a3572065285bdb85268d53258676516a9dc91d39e71ff3109c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6739 9980 bytes

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