Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cf0ccc89157a11…

MALICIOUS

PDF

35.3 KB Created: 2020-04-08 21:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 173bee1eae1f3eff200c1cc5de1e4907 SHA-1: 5309e74b237e69add5619f52df3c47689a6a9c5c SHA-256: a4cf0ccc89157a11466874cbee69848e9cab246b34656ef883a67fa3c3fd19c8
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are part of this link farm. No scripts were extracted, limiting the ability to determine specific malicious actions beyond the link farm.

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://tuxrentalsinnh.com/uploads/1/3/0/6/130620940/130620940.html#shudra+the+rising+review
    • http://rehmanncrabappleconsulting.com/uploads/1/3/0/6/130640032/dafegaje_pubaxuvifokeku_rexiruzenalif_rapofatuxawov.pdf
    • http://interfersolutions.com/uploads/1/3/0/4/130483216/0d7fe085561624.pdf
    • http://handymanremodelingservices.net/uploads/1/3/1/0/131070356/7894225.pdf
    • http://koalaphone.net/uploads/1/3/1/4/131437145/0a4eba.pdf
    • http://popsjohnson.com/uploads/1/3/0/8/130814923/ebf34d2.pdf
    • http://mai-astronomie.de/uploads/1/3/0/2/130270887/neduropag_tusipomirapaxo_papiduwirena.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_off00006166.bin
ca2a3de05b780a51a78321a1f8096d6d45ab51a195a975686812964a4bfb7428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6166 8140 bytes

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