Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb355f7e48f0694…

MALICIOUS

PDF

34.6 KB Created: 2020-04-21 03:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8768367426354b7e2dcd282c2cc35a05 SHA-1: ee9e570aa9ce40510294c1ee0afeabdcabf704da SHA-256: 6fb355f7e48f0694827a011df89f94fee631535ab76c6a270a3d0bf50e33623f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains, indicating a link farm. The ML classifier also flagged this PDF as malicious with high confidence. The embedded links likely serve as a lure to direct users to potentially malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://michaelhiggins.ie/uploads/1/3/0/4/130477755/130477755.html#assignment+front+page+design+samples+pdf
    • http://kogocombat.com/uploads/1/3/1/4/131406069/31b15e8.pdf
    • http://thisismeiamyou.com/uploads/1/3/0/4/130483474/folaravaxi_dorofisadafi.pdf
    • http://leadandthriveconsulting.com/uploads/1/3/1/3/131378838/xixivapubabopososuv.pdf
    • http://bedheadsmedia.com/uploads/1/3/0/8/130813715/1980202.pdf
    • http://chasetheladybarber.com/uploads/1/3/0/2/130270826/nopumuj_mowuvex_xexogajem.pdf
    • http://chisaicritters.com/uploads/1/3/0/6/130639051/5890002.pdf
    • http://itsallaboutjesus.net/uploads/1/3/0/6/130605015/fowedidinufex.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_off000061ed.bin
bb5660c91be4afa650a26babdb978d79a18968332d6e30eeec34ee541ae77fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61ED 7320 bytes

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