Malicious PDF — malware analysis report

Static analysis result for SHA-256 656aa434ea7b79f3…

MALICIOUS

PDF

36.5 KB Created: 2020-04-11 07:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14c1b2ddf6b533353af5e99c6ab770d6 SHA-1: df5e73bc664920ba838dcd32808faf2d10420b81 SHA-256: 656aa434ea7b79f35b77ffe7404de018e39a1dd7ab7ba2f17b0d61780146dbce
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to host further malicious content. The document body, though heavily obfuscated, contains a URL that mimics a search result for 'Finding Nemo movie download', suggesting a lure to entice users to click on these links. The ML classifier strongly indicates maliciousness, and the presence of many external links points towards a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://74-123-77-77.mgwnet.com/uploads/1/3/0/8/130874300/130874300.html#finding+nemo+movie+download+tamilyogi
    • http://huronvillas.com/uploads/1/3/0/2/130291689/fuwizumovurufuzepon.pdf
    • http://fitnoir.com/uploads/1/3/0/4/130435839/f834dafca0d7.pdf
    • http://hubbsrentals.com/uploads/1/3/0/4/130483122/4918196.pdf
    • http://ssquaredesign.com/uploads/1/3/0/7/130776672/65e26.pdf
    • http://edocig.com/uploads/1/3/1/3/131381722/4677075.pdf
    • http://adamsgateway.com/uploads/1/3/0/8/130813945/jitavivag_kegonofifid.pdf
    • http://arts-quest.org/uploads/1/3/0/7/130739286/tagerex_ganoxo.pdf
    • http://nicolexing.com/uploads/1/3/0/7/130775920/2582365.pdf
    • http://shopenb.online/uploads/1/3/0/9/130969742/0e0d09aa9a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005954.bin
8f9de8a23d3cddf3e7c1620f33ea1c96da7b2519451af52930b34b50ed148943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5954 8528 bytes
font_01_sfnt_off00007a60.bin
a1600c79331cba21b3b4a1f056a9d989f02b1280d9db796053b5096bff0b23f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A60 2000 bytes

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