Malicious PDF — malware analysis report

Static analysis result for SHA-256 274e146acb15a158…

MALICIOUS

PDF

39.8 KB Created: 2020-05-11 03:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b5240fc86611e28d72a71917c13b529c SHA-1: a78012be911688605411dc7b7cbdc81124f3eda3 SHA-256: 274e146acb15a1588455826a2c68a274d559de0a823a6c0776b2d8be77b91577
92 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_URI and PDF_SEO_LINK_FARM, indicating a large number of external links. The ML classifier also strongly indicated maliciousness. The document body, though truncated, suggests a lure related to educational content, likely to mask the malicious intent of redirecting users to potentially harmful websites through the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 3

  • 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
  • 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://thehnossaproject.com/uploads/1/3/0/4/130483631/130483631.html#cursive+writing+worksheets+a-+z+pdf
    • http://alzheimerswarrior.org/uploads/1/3/0/7/130775688/refenajepejuxibirer.pdf
    • http://salesallstar.com/uploads/1/3/0/5/130543168/8373507.pdf
    • http://ecclescenter.org/uploads/1/3/0/2/130291493/3764604.pdf
    • http://youngbeyondyoungltd.com/uploads/1/3/0/3/130313237/8c7dc4.pdf
    • http://reaganalumni.network/uploads/1/3/1/0/131070612/638c2e8bb9a8f.pdf
    • http://kookingfun.com/uploads/1/3/1/4/131453269/toruteguzeza.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000702c.bin
b4d3f165a2d186028bd52f950f85bc11b851347e60c9209b3488f2c0726d1094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702C 10848 bytes

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