Malicious PDF — malware analysis report

Static analysis result for SHA-256 09281ada8ee1428c…

MALICIOUS

PDF

46.3 KB Created: 2020-05-15 02:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cdf3052febc178153f4693ab97dfd79 SHA-1: 51a13d6a208d14578512093b9db315bc53aabde0 SHA-256: 09281ada8ee1428cb33e4a8bc1e58bacd1e67869aac84785ef9ce0cd87f53273
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The embedded document body also contains several of these URLs, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the nature of the linked content and the ML classifier's high confidence indicate a malicious intent, likely related to SEO manipulation or hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://denniseasterfineart.com/uploads/1/3/0/2/130272613/130272613.html#happy+movie+background+music+free
    • http://thestreetsmartproject.com/uploads/1/3/1/4/131482864/d0eafd1da461f.pdf
    • http://greencanopycustom.com/uploads/1/3/1/6/131606347/a490ec0b9bedff9.pdf
    • http://hdvelasticity.com/uploads/1/3/1/8/131860378/dixanidexekofomuduju.pdf
    • http://drkrys.com/uploads/1/3/0/8/130873947/vadololokazag.pdf
    • http://tylerseptictankservice.com/uploads/1/3/0/2/130287896/dogiredoxegedi.pdf
    • http://choenigsching.org/uploads/1/3/0/6/130604771/rototobedijoraf.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://scripts.sil.org/OFL
    • 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_off000077d6.bin
d5f7578e6f36286d08ac5953c0c2aa9d9cb373cf0a8c0ab1be31bb7a43f5535f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D6 10316 bytes
font_01_sfnt_off00009b56.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B56 16092 bytes

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