Malicious PDF — malware analysis report

Static analysis result for SHA-256 6497772408ed0256…

MALICIOUS

PDF

52.5 KB Created: 2020-04-11 02:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ec8171dc3308d4fc2f7418662b1b812 SHA-1: 9ae653b3fe8d0b3fa15e00b9756d17fa4383bddd SHA-256: 6497772408ed02567de30b07684b321a28a3cd1fd8a8b3c42cbc49dc0cf4fc46
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, many of which point to other PDF files hosted on similar domains. One of the embedded URLs, 'http://74-123-77-115.mgwnet.com/uploads/1/3/0/6/130603966/130603966.html#architects+scale+ruler', suggests a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of it being used to download further malicious content or redirect users to phishing sites.

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://74-123-77-115.mgwnet.com/uploads/1/3/0/6/130603966/130603966.html#architects+scale+ruler
    • http://fpktigers.com/uploads/1/3/1/4/131483447/senepowurin.pdf
    • http://pcucustomsbrokerinc.com/uploads/1/3/0/6/130621213/4064525.pdf
    • http://thelongwarinterviews.com/uploads/1/3/0/5/130551696/33ccfcd4614584.pdf
    • http://heritagereports.com/uploads/1/3/0/4/130475980/vetenub-kikuvivo-wogegixu.pdf
    • http://rptfo.com/uploads/1/3/0/4/130477026/e120e.pdf
    • http://ghanalearn.org/uploads/1/3/0/6/130605406/3924565.pdf
    • http://number1bakerylane.com/uploads/1/3/1/4/131412426/671318.pdf
    • http://debtley.com/uploads/1/3/1/3/131380894/sanepagulaxizat.pdf
    • http://rachelsbirthandherbal.com/uploads/1/3/1/0/131070152/wamine.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008494.bin
2e4d5be7c3714555030f8b852d540ff4c34ebf1ff74ab263cf3f9639b47d0896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8494 8780 bytes
font_01_sfnt_off0000a623.bin
3bbda7b3b17b1987a96512e13a0a8feab57a28707129b34af62db9440b3e9efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA623 2648 bytes
font_02_sfnt_off0000af74.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF74 16036 bytes

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