Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b7fd7a1e1ca86b…

MALICIOUS

PDF

32.8 KB Created: 2020-05-31 04:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87e6837b03140452ba701ead66b293f5 SHA-1: d020c476289815e67decb02a504fb7432614e1be SHA-256: 19b7fd7a1e1ca86b4eb7c4a4b6ac5a5ece39a6ffded16db6f80124d88e079f8a
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The ML classifier also flagged the PDF as malicious with high confidence. The embedded URLs point to various domains, likely part of this link farm, and one URL contains a product name, possibly a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://fabfairyfinds.com/uploads/1/3/1/6/131636586/131636586.html#altec+lansing+mini+life+jacket+2+man
    • http://bexarwomenvoteblue.com/uploads/1/3/0/3/130313044/d612fc3cbe0c9fc.pdf
    • http://thestudentequestrian.com/uploads/1/3/0/6/130603903/5389850.pdf
    • http://robertsonfinephotography.com/uploads/1/3/1/4/131410090/5196887.pdf
    • http://wellfitforlife.com/uploads/1/3/0/9/130969046/343811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000531a.bin
46fe215c021ce78cd8e412aa3f7a1d9595a48fe578597977a796f28a5515a975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x531A 11076 bytes

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