Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4d560389da169d…

MALICIOUS

PDF

32.6 KB Created: 2020-05-15 06:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b51f76c06c40fd69de52dfd55489f5e9 SHA-1: 7cc7cfca2b8f09a3e33ab6c8c804665bc28633ab SHA-256: de4d560389da169dbe52693c0a22b0bc0304c8ce52476601c6c536c1926fe362
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains a URL that matches one of the extracted links. The primary function appears to be directing users to a vast network of other PDF files hosted across numerous domains, suggesting a link farm or SEO manipulation tactic. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://dividendhousing.org/uploads/1/3/0/5/130551922/130551922.html#least+common+multiple+worksheet+kuta
    • http://trumanssociology.com/uploads/1/3/0/6/130604621/2980078.pdf
    • http://allbyggnationservice.com/uploads/1/3/0/4/130476276/kifozukot.pdf
    • http://godsactive.com/uploads/1/3/0/7/130738974/kikiwoxal.pdf
    • http://cleartitlecamry33.com/uploads/1/3/0/6/130603761/3747943.pdf
    • http://isoiso.dk/uploads/1/3/0/8/130814311/965256.pdf
    • http://totalms.org/uploads/1/3/0/6/130639634/6274314.pdf
    • http://speelkoning.org/uploads/1/3/0/5/130589158/ff78bb242f.pdf
    • http://candytymegifts.com/uploads/1/3/0/6/130639481/modula_vukimat_vejetob_jigikapinaxi.pdf
    • http://inversionesromarco.com/uploads/1/3/1/3/131383977/lupuxaferegotototud.pdf
    • http://vserratoconsulting.com/uploads/1/3/0/8/130813757/00b6d.pdf
    • http://synergyseeds.net/uploads/1/3/0/4/130476370/eb055.pdf
    • http://cleansarasotafl.com/uploads/1/3/0/9/130969354/ritud.pdf
    • http://harlemrose.com/uploads/1/3/0/5/130590391/lenipa_vikilozuxa_rapowubodefe_wuvizitokaviran.pdf
    • http://yltsi.com/uploads/1/3/0/6/130604836/tabelas-xiwoluru.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_off000053c3.bin
af050c378ac6ad23b3633c17b74803b5473c0b227c1b51f7aa910b4175a56859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C3 10400 bytes

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