Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7f83aa111da17d…

MALICIOUS

PDF

56.5 KB Created: 2020-05-22 19:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f92a8e93f81b22a13f4b4224c279bd9d SHA-1: ec52fa8d3a4f4ffa63c7a8bedbb0c6e61030b739 SHA-256: 0e7f83aa111da17d4f98ea5d61a67447f4caab4fad2ed4d33cf146e4ec1ccec6
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to other sites. The document body, though partially obfuscated, includes references to 'Tai chi chuan 24 mouvements' and lists several URLs that appear to be part of this link farm. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8634

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://littlethumbprints.com/uploads/1/3/1/3/131380998/131380998.html#tai+chi+chuan+24+mouvements
    • http://marinolawonline.com/uploads/1/3/0/6/130621119/8906810.pdf
    • http://livewellinsurancellc.com/uploads/1/3/1/4/131407011/5777444.pdf
    • http://lucusled.com/uploads/1/3/0/3/130312976/6288166.pdf
    • http://lzav.alikirsch.com/uploads/1/3/1/4/131453598/nijimowe.pdf
    • http://dksnap.com/uploads/1/3/0/7/130739132/3555693a7d7fb8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d1c.bin
b7cd8561f4e56d77a0b09b8ec5974a1a73c9acc12f045d8062bdf948e60646f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1C 6804 bytes
font_01_sfnt_off00007e4a.bin
5129f82a9a92695a134ff0a01434917f09197dcce788c266366c8ce57341b87c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4A 6884 bytes
font_02_sfnt_off00009386.bin
a28f136c5b3470177825f2bcefe5e912fc1adc8171d48f8634aed6f2bc82494b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9386 13108 bytes
font_03_sfnt_off0000bd46.bin
c7085a6a2f62beca3002898a40be5e038a3193404c9003f0d0adbcee4ef48099		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD46 17540 bytes

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