Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b5e0d306e446ad…

MALICIOUS

PDF

36.8 KB Created: 2020-03-31 20:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9d1a7478690ac18f183ff9e11f8d6c07 SHA-1: d887c27507f9e52fdb798c54ffa14e31deab4f0d SHA-256: c1b5e0d306e446ad1461134c9d3ecfff9faa28db3fdc31f761a12fcbc9a3bc35
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, indicating a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains a reference to 'Jerome bruner date of birth and death' and the authoring application 'wkhtmltopdf', suggesting a lure to potentially malicious content hosted on the linked domains. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://depalmasons.com/uploads/1/3/0/7/130776316/130776316.html#jerome+bruner+date+of+birth+and+death
    • http://mishareads.com/uploads/1/3/0/6/130639646/2fba4377ed9.pdf
    • http://wowsocial.net/uploads/1/3/0/4/130436318/46ddbdc00d6bd.pdf
    • http://sippingallovertheworld.com/uploads/1/3/0/3/130323479/3f2392e.pdf
    • http://thewindingsheetoutfit.org/uploads/1/3/0/6/130639357/c6569.pdf
    • http://lovelustboudoir.com/uploads/1/3/1/1/131164425/wevuxoduvu.pdf
    • http://www.rockiesshrine.com/uploads/1/3/0/6/130640081/9beabb67ce2a1.pdf
    • http://zarktwain.com/uploads/1/3/0/6/130604803/4e7b0cf2c1.pdf
    • http://dizonrosslegal.com/uploads/1/3/0/7/130775870/futurax.pdf
    • http://ecogcoatings.com/uploads/1/3/0/6/130639267/segogi_wesamegebo.pdf
    • http://shizuka-takahashi.com/uploads/1/3/0/6/130639581/23048.pdf
    • http://optima-risk.pl/uploads/1/3/0/7/130776483/radizunul-ritovekurapida-kuwatajajo.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_off0000686f.bin
8923862418784625d3f4167e92c0b6b838e50b357581fa002164ddf19e04dfcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686F 7744 bytes

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