Malicious PDF — malware analysis report

Static analysis result for SHA-256 e846de1a47d5e551…

MALICIOUS

PDF

46.6 KB Created: 2020-03-09 04:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e15b4b1bb95fdf912078f8b1f78d01c2 SHA-1: d47ce9038b4718bbe01195bd9955e9c7b3fce31f SHA-256: e846de1a47d5e551108aead57948afe47e1acf780e4f98bcdad3a55a30fffe00
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are dynamically generated and point to PDF files on various domains. The document body, though partially corrupted, includes text related to a 'questionnaire' and mentions wkhtmltopdf, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate a link farm designed to redirect users. The primary attack pattern involves directing users to potentially malicious external websites.

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://x0389813xstreamtravel.xsideas.com/uploads/1/3/0/8/130815017/130815017.html#cuestionario+de+ambiente+laboral+sano
    • http://photo-artgallery.com/uploads/1/3/0/5/130589217/jekuviwabesu_vuminena_xukawuwa.pdf
    • http://greatridemotors.com/uploads/1/3/0/7/130740316/464d6d.pdf
    • http://www.asiasalesconsulting.com/uploads/1/3/0/7/130738675/266036.pdf
    • http://www.imtem.net/uploads/1/3/0/5/130588222/tabik.pdf
    • http://www.elenicepsicologa.com.br/uploads/1/3/0/8/130814758/4670345.pdf
    • http://www.okashi.be/uploads/1/3/0/7/130775107/d24c56.pdf
    • http://nolanlampson.com/uploads/1/3/0/6/130622058/3662235.pdf
    • http://www.annagbrackrambo.com/uploads/1/3/0/7/130776276/wogavisolusow.pdf
    • http://ns1.seaside.vc/uploads/1/3/0/8/130874134/xinoso.pdf
    • http://bringontheagame.com/uploads/1/3/0/4/130489696/0276447.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_off000080b2.bin
8ae01df6cc0d385a738046afe4dac1b4ec647f99da6a51ffcabdff2ae9fb5431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B2 9712 bytes
font_01_sfnt_off0000a335.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA335 1708 bytes

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