Malicious PDF — malware analysis report

Static analysis result for SHA-256 be973df4819e2c95…

MALICIOUS

PDF

39.6 KB Created: 2020-04-11 03:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c729f5a7399de7fd9febcb91af385bb9 SHA-1: 236eea874c1423f0d4da8d0ebedf9d10aae90da6 SHA-256: be973df4819e2c956ba3f2a68584a97ce53717188c83f4c08187824ffa38851d
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a method to distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nupelicanparty.org/uploads/1/3/0/6/130639541/130639541.html#whats+a+juul
    • http://lanesportslive.com/uploads/1/3/0/5/130588493/9168325.pdf
    • http://leberechtandpartners.com/uploads/1/3/0/7/130739490/panazulabutugo_gutevenuputif_minalofovuleda_bagep.pdf
    • http://stephaniepolen.com/uploads/1/3/0/5/130588206/7640625.pdf
    • http://ricor.info/uploads/1/3/1/3/131379121/wodeluju.pdf
    • http://mbkenyatrip17.com/uploads/1/3/1/4/131455337/juzodagavafenimutune.pdf
    • http://dianamooredigitalportfolio.com/uploads/1/3/0/6/130639385/26ca2d6.pdf
    • http://windfallpartners.net/uploads/1/3/0/5/130544009/622813.pdf
    • http://mutedluck.org/uploads/1/3/0/5/130589218/buzepipadofezujab.pdf
    • http://windfallpartners.net/u
    • 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_off000072bd.bin
c888ae6e7dcb43acd5af578afb797485b9c36559d71f225db36829c44c06b9c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BD 7916 bytes

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