Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbd8642de8aa5be…

MALICIOUS

PDF

38.8 KB Created: 2020-04-05 11:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce9392d31e3feb78758b20d974fe92a8 SHA-1: 666c624616f76aa895d7ddaac4d1266d90efc939 SHA-256: ecbd8642de8aa5be21fe7e8da14eb96445d3ac967cdc6f522b6914e808c60ca8
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, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, though partially corrupted, contains references to educational material, suggesting a lure to entice users to click on the embedded URLs.

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://jannproperties.net/uploads/1/3/0/8/130813526/130813526.html#ejercicios+frances+4o+primaria+pdf
    • http://edgeheadphones.com/uploads/1/3/1/4/131406211/5491031.pdf
    • http://canceredinstitute.net/uploads/1/3/0/5/130539554/18be2c17ef9c.pdf
    • http://robinreitzes.com/uploads/1/3/0/6/130621385/8732679.pdf
    • http://renewportinc.org/uploads/1/3/1/3/131381101/fd5139e71a.pdf
    • http://westinhotel.org/uploads/1/3/0/4/130488701/rikonulixuxub.pdf
    • http://commercialpromotionalumbrellas.com/uploads/1/3/0/6/130621140/xiboliliwasupi_nunofov_baxokisosexi.pdf
    • http://imaniashante.com/uploads/1/3/0/8/130874393/5887921.pdf
    • http://lightyourwayphoto.com/uploads/1/3/1/1/131164252/ca98331011d7.pdf
    • http://beaconstudcobs.com/uploads/1/3/0/2/130271132/5821800.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006868.bin
c3faed37139eb0834824fb64a1fd1c7955109b002eb84dbe4d93f159730153e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6868 10528 bytes

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