Malicious PDF — malware analysis report

Static analysis result for SHA-256 979dcb3d9fb12094…

MALICIOUS

PDF

71.4 KB Created: 2020-04-06 15:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea9bd1cce07fcc26bcb8ff42ba59fec6 SHA-1: 5dbb25ff878f50771ecbf06781c99850cfceec82 SHA-256: 979dcb3d9fb12094c6a27037e41a2eb360a21a758cc98590788abbd5d0f8c9de
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous external links, many of which are hosted on domains that appear to be part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages. The document body, though heavily obfuscated, contains a URL that mirrors the suspicious external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://19fathom.com/uploads/1/3/0/5/130551416/130551416.html#what+is+the+scope+of+sociology+of+health
    • http://fleurissant.com/uploads/1/3/1/4/131406950/5665996.pdf
    • http://18390621srn.com/uploads/1/3/0/4/130435680/juxakojofidap.pdf
    • http://goldenbeachcafe.com/uploads/1/3/0/6/130620547/fbd15d7cc.pdf
    • http://comicmaniacdesigns.com/uploads/1/3/1/4/131483266/3544265.pdf
    • http://ritasclassydesigns.com/uploads/1/3/0/7/130740591/dekab.pdf
    • http://saraheller.com/uploads/1/3/0/7/130776350/gigutomis-kubodal.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_off0000eff5.bin
9a8cbb5d7c8f653a63ca508cb35e95ad03a65895fd9f17549ee3d2b1b4c40d6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 8064 bytes

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