Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5979ee5a78e7a5a…

MALICIOUS

PDF

54.6 KB Created: 2020-03-23 12:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4f30ae4982eeb2a77acdcb44e804cee SHA-1: f4e592149085fb1d0de568224438ad3a23777893 SHA-256: c5979ee5a78e7a5a99bcaa8fb7f306e9441ccf71ee2bcf67313bb423fae27868
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 to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the extensive link farm.

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://bodyworkbybarb.com/uploads/1/3/0/7/130739860/130739860.html#bless+me+ultima+ch+9+summary
    • http://paws4playsports.com/uploads/1/3/0/7/130776102/18887011fe5c4.pdf
    • http://ensuringqualitycare.net/uploads/1/3/0/6/130621101/6849527.pdf
    • http://myapotheka.com/uploads/1/3/0/4/130489072/vimusalo.pdf
    • http://agentflamingo.com/uploads/1/3/0/5/130590153/3c491c2c.pdf
    • http://hardwaterco.com/uploads/1/3/0/6/130621412/kufoduwi.pdf
    • http://brickstherapy.com/uploads/1/3/1/0/131070998/vodefejur_remopudasesitu_tozuro.pdf
    • http://arthenia.com/uploads/1/3/0/8/130813961/fc88c75ac9.pdf
    • http://drinklesssugar.com/uploads/1/3/0/5/130589123/d297f.pdf
    • http://stormikc.net/uploads/1/3/0/4/130488839/66bdfe0cc.pdf
    • http://companiesandmarkets.com/uploads/1/3/0/7/130776351/pobuwabad.pdf
    • http://lessismoreallnaturals.com/uploads/1/3/0/2/130288731/senit.pdf
    • http://bluewaternavy.org/uploads/1/3/0/6/130620800/5913037.pdf
    • http://prosser-snelling.com/uploads/1/3/0/2/130289238/rodeveriwek_nututabufi_ridogijasuxe.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_off0000adfe.bin
f5fe363f10458f574eb09de429ffaa39abff76590c28170213ade9e69b213145		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADFE 8328 bytes

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