Malicious PDF — malware analysis report

Static analysis result for SHA-256 787a40e152f9813a…

MALICIOUS

PDF

45.2 KB Created: 2020-03-29 13:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31e7054049a4fbf6f3ab3f64cd7e91f4 SHA-1: 5140a34429bc78365c5965d2dd575b19d7e5bc8d SHA-256: 787a40e152f9813a910d24da8b70ce26ebf27580a416a9ef6852da85eeffddb4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to importing CAD files and mentions the authoring application 'wkhtmltopdf', suggesting a lure to download or view content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of external URLs, likely for malicious redirection or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://djsacademy.com/uploads/1/3/0/2/130289226/130289226.html#import+dwg+to+sketchup+without+pro
    • http://myfriendwholovestocook.com/uploads/1/3/0/5/130551618/a0a36ed7fe761.pdf
    • http://janisolson.com/uploads/1/3/0/5/130542822/mepafon.pdf
    • http://advancetravelandtours.com/uploads/1/3/1/3/131380786/kekekumidibafogezu.pdf
    • http://spikeitforlife.org/uploads/1/3/0/4/130483821/mupakobutu.pdf
    • http://vibinabroad.com/uploads/1/3/0/4/130476168/9276881.pdf
    • http://himalayanmosaics.com/uploads/1/3/0/4/130436431/989801.pdf
    • http://rethinkautismneeds.com/uploads/1/3/0/2/130289354/1892339.pdf
    • http://algaebookandpaper.com/uploads/1/3/0/6/130604615/modubexamidemeg_fojafurabivoxuk_mawafa.pdf
    • http://hasanhadee.com/uploads/1/3/0/6/130621407/lefebi_rales_metoruzafewez_titokunetirom.pdf
    • http://friendsofsevierpark.net/uploads/1/3/1/0/131070456/24b5a29fa7.pdf
    • http://littlebabyfessler.com/uploads/1/3/0/7/130739893/7247369.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_off0000861e.bin
ba9f68021f5aa0f2c937afd513194568830bae003af91cc9c003c9d648b7d5f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x861E 8248 bytes

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