Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e42d9fe4e95c50…

MALICIOUS

PDF

38.3 KB Created: 2020-04-20 20:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 24c99c4428f98bf1f4022f85f0dbbf39 SHA-1: 04b94ab858e6539a7a5221a1380aa112ef04679b SHA-256: 28e42d9fe4e95c50085c82fc0bd7c8f9e87ac0eb207a1b17393c2b23bcf31684
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of external links to other PDF files hosted on various domains, indicating a link farm. The primary URL http://tarasnaumenko.com/uploads/1/3/0/6/130605430/130605430.html#swift+show+action+sheet+in+ipad is also present, suggesting a potential lure or redirection mechanism. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://tarasnaumenko.com/uploads/1/3/0/6/130605430/130605430.html#swift+show+action+sheet+in+ipad
    • http://anupasjourney.com/uploads/1/3/1/3/131383648/8778644.pdf
    • http://nationalhellenicsociety.net/uploads/1/3/0/2/130273872/92b5f36.pdf
    • http://detroitretreat.com/uploads/1/3/0/6/130620606/b4c54df72db.pdf
    • http://8thstreetgirlsphotographyllc.com/uploads/1/3/0/4/130476616/5268458.pdf
    • http://rewindind.com/uploads/1/3/0/5/130550970/zizujapokowedi-jimak-dadexula.pdf
    • http://michiganpc.org/uploads/1/3/0/4/130436365/e8d93d785.pdf
    • http://graceandainc.com/uploads/1/3/0/7/130739169/dozozosipu.pdf
    • http://iradivingclub.eu/uploads/1/3/0/9/130969420/fukixa.pdf
    • http://unitydenton.com/uploads/1/3/1/6/131606730/2163ac1f0a800b9.pdf
    • http://nationalhellenicsociety.net/uploads/1/3/
    • 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_off00006b92.bin
c746740e073e97af210b3c4e4da5645d4c0d8ba36d015a4fb7a0662900f44bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B92 8664 bytes

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