Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ee2d09c1d9b070…

MALICIOUS

PDF

77.3 KB Created: 2020-05-31 18:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfd8076d6ef9aba51af1f0610ac9d9a9 SHA-1: 3820f44357d6991c946633075ca6a1d78a557d84 SHA-256: d8ee2d09c1d9b07082d83b3f152dcd2c22f86b7551c2a84f39f1d4a34e272a99
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to WordPress domains with numeric slugs, indicating a potential SEO link farm. One of the primary external URIs, http://mohamedandanna.com.au/uploads/1/3/0/5/130589334/130589334.html#sle+lupus+guidelines, is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'sle lupus guidelines' and references wkhtmltopdf, suggesting a lure to a website for downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9818

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://mohamedandanna.com.au/uploads/1/3/0/5/130589334/130589334.html#sle+lupus+guidelines
    • https://limowuzeram.files.wordpress.com/2020/05/bunolunimeseg.pdf
    • https://sabuninovaju.files.wordpress.com/2020/05/44805205171.pdf
    • https://panoxovijudo.files.wordpress.com/2020/05/90980835643.pdf
    • https://vasoponox.files.wordpress.com/2020/05/bikuwazobegarugonebam.pdf
    • https://tivujoz.files.wordpress.com/2020/05/bumaredetolimosebed.pdf
    • https://gavumafan.files.wordpress.com/2020/05/sajujipoxopa.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_off0000eb3f.bin
d9908166c1a7c67a7ca6a5122613e1705da04def9231378fb9aa108cc7d8d54b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 12708 bytes
font_01_sfnt_off00011506.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 16204 bytes

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