Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a91e0b80a6ed436…

MALICIOUS

PDF

66.6 KB Created: 2020-04-08 03:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb483c3fc1f53633ec116d917f2bea5f SHA-1: cd22a74b729f72cbcc5b9ea984558221225848ad SHA-256: 4a91e0b80a6ed436c7c4c3fd2f3ac853f977bc63dd563cf81075aa75bc336e67
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are numerically or generically named, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that mirrors the structure of other suspicious links found in the heuristics, indicating a potential lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nationalriskmanagementgroup.com/uploads/1/3/0/6/130621113/130621113.html#create+unique+index+oracle+example
    • http://daniellerosenorton.com/uploads/1/3/0/4/130488993/54a54c.pdf
    • http://vladeticoderhem.me/uploads/1/3/0/6/130604244/6689a62.pdf
    • http://estherdieteticienne.com/uploads/1/3/0/4/130436089/4ad9b94.pdf
    • http://brandsbcn.com/uploads/1/3/0/3/130379718/89315a59d6b5.pdf
    • http://ourguysvb.com/uploads/1/3/0/7/130739713/jagogeta-fibovefi-wiwaz-nodij.pdf
    • http://farmhousedesignsnj.com/uploads/1/3/0/8/130814011/8848468.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_off0000da69.bin
daa47d58cf6e5d59b1213bb8dcdddc22c30c1954f27be33492a1c11d0e470478		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 9196 bytes

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