Malicious PDF — malware analysis report

Static analysis result for SHA-256 973f74e7c59da3bd…

MALICIOUS

PDF

31.0 KB Created: 2020-04-05 08:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f38097817f6709adbc28c39dd9210304 SHA-1: dc60b70582f5f6aeac2fe6e8c8aab0b1fac6f9eb SHA-256: 973f74e7c59da3bd2fdb39b8bea7d7a6df99d1f2c48d1fc02fd5bca69f332f59
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, characteristic of a PDF link farm, pointing to various domains. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://perfectled.org/uploads/1/3/0/4/130475996/130475996.html#bissell+proheat+2x+8920-v
    • http://www.hellobeautifulconroe.com/uploads/1/3/1/4/131407504/3132961.pdf
    • http://zumarock.org/uploads/1/3/0/7/130739235/lemovum_tumepulesunes_wifapilubem.pdf
    • http://skirts-by-elle.com/uploads/1/3/0/6/130603737/feccd7fc9c.pdf
    • http://cynbboutique.com/uploads/1/3/1/3/131381679/refuvajevuxogixes.pdf
    • http://excelproperties.net/uploads/1/3/0/6/130603822/8164065.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_off00005303.bin
93643e1273417be3b468093845f99b878d37626e62afd08de2ea6a67ab79aa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5303 7600 bytes

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