Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c225bacd66ce6d…

MALICIOUS

PDF

36.9 KB Created: 2020-05-23 17:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cb8a998ea85c2d70325eb010d7b6056 SHA-1: 5820147559e019c469139537c4bb96f8f9ccc5e5 SHA-256: 00c225bacd66ce6d6869c00845ba30b789efdda652b001ff408e608cd7462286
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely serve as a link farm or a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://mta-sts.mailserver.brianlettauthor.com/uploads/1/3/0/3/130379246/130379246.html#head+and+neck+anatomy+book
    • http://dosnorte.com/uploads/1/3/1/4/131406930/1368ff.pdf
    • http://precisionpackingandmoving.com/uploads/1/3/0/2/130272569/5376886.pdf
    • http://sheriffproperties.com/uploads/1/3/0/5/130590578/51e72.pdf
    • http://exserver.cavertwire.com/uploads/1/3/0/7/130740508/ceebf8c8d8.pdf
    • http://brynnmaenhoutphotography.com/uploads/1/3/1/3/131379894/9933617.pdf
    • http://matematicaslupitarodriguez.com/uploads/1/3/0/6/130620737/3043403.pdf
    • http://dtukajak.dk/uploads/1/3/0/9/130969209/4868662.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000653f.bin
472f827197d37c2944f4183454087d353e343e54279c0a14062aada7053589d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653F 10480 bytes

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