Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08071e453bc8d06…

MALICIOUS

PDF

45.0 KB Created: 2020-04-08 23:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 01fee1dc085faad77a36d0a7d7b9b553 SHA-1: 0c77f889f4211c4b2c716bcde4f155bab7d455cc SHA-256: b08071e453bc8d06ff01e9e673b9d1257e8d360cad6b501921075a2df961a1f4
92 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier with high confidence. It contains a large number of external links, many pointing to other PDF files on different domains, suggesting a link farm or distribution mechanism. The presence of these links and the overall structure strongly indicate a malicious intent, likely to redirect users to harmful content or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://apsonic.biz/uploads/1/3/0/6/130605065/130605065.html#pickle+pee+dark+souls
    • http://basimpleasy.com/uploads/1/3/0/4/130435581/wegobamugom.pdf
    • http://karinjohansson.net/uploads/1/3/0/3/130313434/4331593.pdf
    • http://xtremeshootingsports.com/uploads/1/3/0/6/130604905/8835762.pdf
    • http://wageandhourcalculator.com/uploads/1/3/0/6/130603860/af7b95b8e2fd0a6.pdf
    • http://advanceadvocacyandsupport.com/uploads/1/3/0/6/130639787/gefuje.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_off0000881c.bin
40fa48ed9c6db748d415bd10a59c71505a06fb97115bc169c37a0322ce5a4619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881C 8328 bytes

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