Malicious PDF — malware analysis report

Static analysis result for SHA-256 0336045d04c3b6d8…

MALICIOUS

PDF

49.8 KB Created: 2020-06-19 21:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 852b2ab29a46021d2045df60d0137f4f SHA-1: e847e3455e984df753d7bd8820162181e833a95d SHA-256: 0336045d04c3b6d8b1aec19faf6b0052cac4a782edf74d3b9ced142ee2de8a63
104 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of suspicious URLs points to a content-luring or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://mx10.carmichaelnl.com/uploads/1/3/0/7/130739308/130739308.html#ski+lessons+at+heavenly
    • http://naomitamr.net/uploads/1/3/0/7/130739632/silusamolopejum.pdf
    • http://sculpsurepittsburgh.net/uploads/1/3/2/7/132740586/f47d408972.pdf
    • http://shopdsu.com/uploads/1/3/1/8/131871874/bukawiwibumomunolopo.pdf
    • http://cpanel.conniefay.com/uploads/1/3/0/7/130776040/patonod_wijekoxajepevaz_xazejobavibaw_xererunizob.pdf
    • http://catbackhoespares.com/uploads/1/3/0/6/130604077/pavagikikikos.pdf
    • http://peopleinsyncltd.com/uploads/1/3/0/3/130313002/9468924.pdf
    • http://stonecircleapothecary.com/uploads/1/3/1/1/131164386/koxubo.pdf
    • http://v.siyim.com/uploads/1/3/2/6/132682998/3269556.pdf
    • http://travelinalong.voyagerwebsites.com/uploads/1/3/1/4/131438844/fowenor.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008694.bin
ee6e7d0592088012e1dd62c7fc052c6d3474ce81662a5b189df854e6ae967e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8694 4792 bytes
font_01_sfnt_off000096d3.bin
5f685797acf5f1fc9a74a4ead0c61ef62a47a86f7cd1e4be545d3f3e54bebd7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96D3 10756 bytes

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