Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c99d80e518465a…

MALICIOUS

PDF

40.5 KB Created: 2020-06-02 09:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a4f4c6acbe30807501773f24d1db56e SHA-1: 3b4ed1cb8535520bb3f1d13ca59ff7c78d7295be SHA-256: 76c99d80e518465a478ff760a943cbfb6009c9b9e8e63ae5aba71acef1f86161
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file 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 strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to manipulate search engine results or distribute additional malicious content, aligning with the Spearphishing Attachment and Ingress Tool Transfer MITRE ATT&CK techniques.

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://katharineruddock.com/uploads/1/3/0/7/130739022/130739022.html#the+favor+of+god+jerry+savelle+pdf
    • http://uniqueznaturaltouch.org/uploads/1/3/1/4/131454420/tijadosa.pdf
    • http://young-bros.com/uploads/1/3/0/4/130476678/rofelo-jusomaje-janipurijo-lepaxuv.pdf
    • http://jonortizcustoms.com/uploads/1/3/0/5/130588393/3d44e861093.pdf
    • http://dignityair.com/uploads/1/3/0/6/130621393/9825158.pdf
    • http://raybreezeebeats.com/uploads/1/3/1/4/131482926/49bbb14.pdf
    • http://ebtvevents.net/uploads/1/3/0/8/130874668/a1401e69cfdc1.pdf
    • http://realizingthepromisesofgod.com/uploads/1/3/0/7/130739098/99e80c969386b.pdf
    • http://katharineruddock.com/uploads/1/3/0/7/130739022/terms.html
    • http://katharineruddock.com/uploads/1/3/0/7/130739022/dmca.html
    • http://katharineruddock.com/uploads/1/3/0/7/130739022/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://diwunibe.files.wordpress.com/2020/05/70837371887.pdf
    • https://jutirupejiba.files.wordpress.com/2020/05/33349780426.pdf
    • https://kebiromoge.files.wordpress.com/2020/05/18296022870.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007166.bin
70b0e9a9dfac14996609cea1a60fb864de97ee1108f1ec53c70a52d68f6953f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7166 10856 bytes

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