Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b262e0a8fe1ad7…

MALICIOUS

PDF

47.7 KB Created: 2020-03-24 21:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e3db798db22dfdb68430a99d7eb5d9a5 SHA-1: c59088b145a2be4d3208a5195f16ea4595f19f25 SHA-256: 25b262e0a8fe1ad74a014747a0de2c416670348c699ee6b3ec363e1bc291b70e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains some of these URLs, suggesting the primary purpose is to redirect users to these external resources. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://smallgardenconcepts.com/uploads/1/3/0/4/130477201/130477201.html#von+mises+yield+criterion+derivation
    • http://mfwwinecompany.com/uploads/1/3/0/5/130588674/3630411.pdf
    • http://www.bytheblade.shop/uploads/1/3/0/4/130435500/bimukavurefexerij.pdf
    • http://www.inspiredreambelieveachieve.com/uploads/1/3/0/5/130541817/jirojomiwu.pdf
    • http://nxnaturallife.com/uploads/1/3/0/6/130604544/dixewigadew-wikurigamasigep.pdf
    • http://lirba.net/uploads/1/3/0/7/130739705/8535139.pdf
    • http://yunlinyouth2019.com/uploads/1/3/0/7/130739363/wesemikukiko.pdf
    • http://doubletuweddings.com/uploads/1/3/0/8/130813979/ruwakor-jolutamub.pdf
    • http://wellfitforlife.com/uploads/1/3/1/0/131070702/jegimunaxilepe-kexolikow-femak.pdf
    • http://nanomat2019.com/uploads/1/3/0/6/130605306/a009e.pdf
    • http://biharvidyapith.com/uploads/1/3/0/4/130483634/9b931e1b39b62a7.pdf
    • http://mta-sts.mx.buddcreek.org/uploads/1/3/0/7/130775341/1be3e.pdf
    • http://en.wikipedia.org/wiki/File:Yield_surfaces
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009044.bin
711211872bd6a7913fe9694b40a6c5c4fc623f55c1e66e3aacb8f02d32e91204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9044 8812 bytes

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