Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3fa3f2679fde71…

MALICIOUS

PDF

28.8 KB Created: 2020-05-27 07:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e15cf30ecc075f79147f8291ce8b509 SHA-1: 1ee66d83cf5d3de5f1c997b413a29e43fabbf674 SHA-256: 0c3fa3f2679fde71cfb0e477451e22f32d1960d2f119f8545cc310d74cb911d5
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the embedded URLs suggest a link farm or redirection scheme, potentially for SEO spam or to distribute further malicious content. The document body itself is heavily obfuscated and contains some of these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rnscleaning.com/uploads/1/3/0/7/130738755/130738755.html#elf+bowling+hawaiian+vacation+part+1
    • http://evensongmedia.com/uploads/1/3/0/7/130775182/nivuwevadebuxi-kibiro.pdf
    • http://cardozoenterprises.net/uploads/1/3/1/0/131070625/wolejuno.pdf
    • http://sarecommunications.com/uploads/1/3/1/4/131438860/4633741.pdf
    • http://ipakistanbusinesschannel.org/uploads/1/3/0/7/130738893/zodisosigo-lipalososuse.pdf
    • http://pharmacorre.com/uploads/1/3/0/8/130874031/mowalopenomov.pdf
    • http://74-123-78-142.mgwnet.com/uploads/1/3/0/6/130604923/6333550.pdf
    • http://mbdrinks.com/uploads/1/3/0/8/130813531/84e5f73fa08766.pdf
    • http://cpcontacts.redhands.nl/uploads/1/3/0/5/130590076/4020b8b407c6e.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_off00004621.bin
9504c949939811408f4b3d4b176422e1eae1741de326a1d063e30662e456aa70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4621 9988 bytes

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