Malicious PDF — malware analysis report

Static analysis result for SHA-256 77df70d69acd6c15…

MALICIOUS

PDF

44.9 KB Created: 2020-04-19 19:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1857f4243a93b9337865b219cf989920 SHA-1: 98a53b0e3fa982df4058a2d57fb4409a91cf111f SHA-256: 77df70d69acd6c1554ec534c88a893237eeb39439dda23bfb30142150df1e06b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect users to potentially malicious content or engage in SEO link farming. The document body itself is heavily obfuscated and contains metadata from wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://theclassyandjazzyboutique.com/uploads/1/3/0/5/130539714/130539714.html#carrom+board+king+game
    • http://trinitysyep.org/uploads/1/3/1/4/131454883/raxusanegavawa.pdf
    • http://tlhomeanddesign.com/uploads/1/3/0/8/130814004/7936490.pdf
    • http://viverofloresdelperu.com/uploads/1/3/0/7/130738874/2853726.pdf
    • http://praiaserena.com/uploads/1/3/0/2/130270993/1105331.pdf
    • http://activismireland.com/uploads/1/3/0/7/130739073/gapixamezafowil_sutivefivope_vopaweneb_mobom.pdf
    • http://hoodoohemp.com/uploads/1/3/1/3/131378779/03559be3ac.pdf
    • http://stardustmenu.com/uploads/1/3/0/4/130483331/lotugaruvibesodefi.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_off000070a6.bin
61ba8f58404b01e8c3a715cddc88f0c115c0980eed5bf4aca4ffc67472d4ee57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A6 8940 bytes
font_01_sfnt_off0000928b.bin
c6c28444bcd94379862b6cc7f8cfcdbcdaeb026857ccdb099d87626a561054a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x928B 16092 bytes

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