Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71cf5b1d04bd660…

MALICIOUS

PDF

38.0 KB Created: 2020-04-05 04:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 13b4d4241026792dd13cead77bf65958 SHA-1: 7b2762b6fc2c0db4aec87c484f50acb67033db27 SHA-256: e71cf5b1d04bd6601c8f1710fd6c7396532a94f6d94f00158916715cdcc57cc5
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of compromise, suggesting the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://exlibrisverbatim.com/uploads/1/3/0/5/130539841/130539841.html#corel+draw+herramientas+de+seleccion
    • http://playmoorstudios.com/uploads/1/3/0/6/130640067/2fa17ed7.pdf
    • http://chartwell.info/uploads/1/3/0/2/130288381/piledanuwuteduza.pdf
    • http://volleglas.nl/uploads/1/3/1/1/131163980/7e84628f2d3f.pdf
    • http://centralvalleywellnessexpo.org/uploads/1/3/0/6/130604516/76dae0bebfe1.pdf
    • http://speaknaturallyoftampabay.com/uploads/1/3/0/4/130477146/2037720.pdf
    • http://evakraus.ch/uploads/1/3/0/9/130969888/58bd0d1873e27.pdf
    • http://divorceirl.com/uploads/1/3/1/4/131453573/luxovaxafupoxe.pdf
    • http://itmmechanicalservices.com/uploads/1/3/0/8/130813827/8d810ecbd.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_off00006ba4.bin
4eb49246faa5d08ab50a6c033eafd9c5d82daf837d43458a6f63bd45f046314f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA4 8388 bytes

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