Malicious PDF — malware analysis report

Static analysis result for SHA-256 083e2f95ce6e2b5e…

MALICIOUS

PDF

39.2 KB Created: 2020-06-16 16:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 376a37e76a817c0a06b1d4aecbbf0406 SHA-1: 0aabb3e4ed67c36c8949cd7a73de1f7b44e769e9 SHA-256: 083e2f95ce6e2b5e89093a22d67ad44932faae5847cf2eee30affe7d5c8b5354
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and the presence of numerous external links indicate a potential for redirecting users to malicious sites or hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://blackskysystems.net/uploads/1/3/2/3/132302751/132302751.html#wahl+metal+guide+combs
    • http://ashevillepower.com/uploads/1/3/0/5/130539820/fozakezixotovu.pdf
    • http://frula.nl/uploads/1/3/1/4/131453535/b868841709.pdf
    • http://paphal.com/uploads/1/3/0/3/130324206/2cd86370757c3.pdf
    • http://mrsubmx.com/uploads/1/3/0/5/130590138/6089718.pdf
    • http://nasettiprofumi.com/uploads/1/3/0/3/130323518/7602971.pdf
    • http://cpanel.ashleymartinportfolio.com/uploads/1/3/0/6/130621720/vizakitukanolo.pdf
    • http://eeswfl.com/uploads/1/3/0/2/130287279/lejaxivimuvab.pdf
    • http://cambridbemasonry.com/uploads/1/3/0/7/130739308/tugugazove.pdf
    • http://mail.manfredocamperio.com/uploads/1/3/0/4/130476272/gekadubilotemenep.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005545.bin
99ceb303fad2cd99c6421ec7d9e541e2bdfa17a5f5041c0886510731069f9340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5545 10928 bytes
font_01_sfnt_off00007a9a.bin
3745d395dffe053ce12bb6e6d543a89fda750690c61e1e786fb35984b58e44e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9A 16344 bytes

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