Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9b9caa41be32dc…

MALICIOUS

PDF

38.2 KB Created: 2020-03-25 10:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fdc7773b174955ac5c711fdef9169a09 SHA-1: c3746fee7d4688ad996789a899cd88d9c89d8bda SHA-256: 4a9b9caa41be32dc6a3fcdf09c99eea62e2b7a27493902d63272ed9fefacd610
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded 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 supports the malicious verdict. No scripts were extracted, limiting the analysis of direct payload execution.

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://candlecrazy.org/uploads/1/3/0/7/130739250/130739250.html#porque+decir+porfavor+y+gracias
    • http://ashleysweb.website/uploads/1/3/0/7/130775076/badatoganalo.pdf
    • http://tommoretoncamera.com/uploads/1/3/0/6/130603994/08369f48ab09.pdf
    • http://theriverhouse102.com/uploads/1/3/0/7/130776350/5619022.pdf
    • http://joyfulsoundchoir.us/uploads/1/3/0/5/130552097/8024883.pdf
    • http://incubatinginspiration.com/uploads/1/3/0/4/130476344/368041.pdf
    • http://royalematch.com/uploads/1/3/0/6/130605270/8668132.pdf
    • http://www.old-palm-bay.com/uploads/1/3/0/6/130605291/720592d176.pdf
    • http://leafylocale.com/uploads/1/3/0/4/130483842/najabegef.pdf
    • http://rowanlestat.com/uploads/1/3/0/7/130740209/potubibo.pdf
    • http://sandyburlesoneportfoliowfu.com/uploads/1/3/0/8/130813786/kitolurojov.pdf
    • http://cmprofessionaleventsdbscg.com/uploads/1/3/0/5/130540406/546910.pdf
    • http://ghtoolonline.com/uploads/1/3/0/2/130289333/1982987.pdf
    • http://targettradingsystem.com/uploads/1/3/0/3/130313106/4283498.pdf
    • http://roche-electricite.com/uploads/1/3/0/6/130620846/bizanimuxegusozor.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_off00006992.bin
43ce626ba28b888580bed83bc0dea86bd144fd46dc4381e2a3ebb3067e0ac38f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6992 8992 bytes

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