Malicious PDF — malware analysis report

Static analysis result for SHA-256 15251aaebd8e6f3c…

MALICIOUS

PDF

37.3 KB Created: 2020-04-09 02:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3c356d8eb908e66dce64d1dfab9b343f SHA-1: 3f9c426f33a6e71d3d170b3acfdbddf6bb91b982 SHA-256: 15251aaebd8e6f3cc88987cf42c38c4bcaada0042b166875f59338c2bb53339f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment. While no scripts were directly extracted, the PDF structure itself facilitates the embedding of these links, potentially leading to further compromise.

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://cheeseandchutneyoakcliff.com/uploads/1/3/0/6/130620482/130620482.html#life+application+study+bible+niv+third+edition
    • http://msportsix.com/uploads/1/3/0/7/130739522/fopisov.pdf
    • http://aiotherapymanagement.com/uploads/1/3/0/2/130291489/65d6d.pdf
    • http://mrsburchnallsclassroom.com/uploads/1/3/0/8/130873954/sizosatidurigurox.pdf
    • http://radiogirlcami.com/uploads/1/3/0/8/130815097/vurasivorilo.pdf
    • http://bremerschoolofirishdance.com/uploads/1/3/0/9/130969810/tegelepezuxipuj_zudekekelamudes.pdf
    • http://global4edu.com/uploads/1/3/0/8/130874523/bakokipifasiz_gaxudogudi.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_off00006475.bin
25bfd7eeaede67220a4e0ee86c80e8ce8229ed2649c35d61ab1a77666a99f405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6475 9688 bytes

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