Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7e680bdca7eff5…

MALICIOUS

PDF

48.1 KB Created: 2020-04-24 22:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: daaf91ea5ced1518158ce7c54f437e37 SHA-1: 6a2957d8cdaac238cb6b664d5ae59ec8690bdb4f SHA-256: 4a7e680bdca7eff588a00b74cbf069cbc1d8cda542e01c1bb188a0b0ae617021
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files on various domains. This pattern is indicative of a link farm designed to obscure the true malicious destination or to distribute a large number of lures. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown URLs supports this assessment. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://julianthology.com/uploads/1/3/0/7/130776247/130776247.html#bohong+kamu+tukang+bohong
    • http://293149343277459497.com/uploads/1/3/0/6/130620751/fusizabowus_zudit_mopexede.pdf
    • http://chaosonthehomefront.com/uploads/1/3/1/6/131606305/3474193.pdf
    • http://jldprod.com/uploads/1/3/0/5/130551112/menopetotuwot-gubode.pdf
    • http://learnguitarwithmonte.com/uploads/1/3/0/3/130313388/mezazulow.pdf
    • http://lasmicheladasbarandgrill.com/uploads/1/3/0/7/130775558/vevirela_davolabepewu.pdf
    • http://rohitiswrite.com/uploads/1/3/0/3/130323527/6931243.pdf
    • http://carmendaughertyphotography.com/uploads/1/3/0/6/130621418/darurape.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_off000081db.bin
b918aae428d1ac505efb1fa007c851e52e8d46ccc0f087fdbc005356542104bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DB 7752 bytes
font_01_sfnt_off0000a018.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA018 16036 bytes

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