Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcb735180a0571a…

MALICIOUS

PDF

37.1 KB Created: 2020-06-05 00:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b6ce48270e159557c09e8b2f8257fce SHA-1: 381efba1e4cdb60b24405d8711867b1c7c54b9ed SHA-256: 4bcb735180a0571ab79e762e5ca19fe22e1d3ed4914fcf4e3ecc24b098f2e12d
62 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains references to 'Digestive enzyme worksheet post lab answers' and the authoring application 'wkhtmltopdf', indicating a potential lure for educational or academic content. No scripts were extracted from this sample.

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://mrmacbiblebook2.com/uploads/1/3/1/3/131382271/131382271.html#digestive+enzyme+worksheet+post+lab+answers
    • http://martoraj.com/uploads/1/3/1/4/131438240/puruxuvom.pdf
    • http://superioreslcourses.net/uploads/1/3/0/7/130738482/5855901.pdf
    • http://mail.logoexperiencias.com/uploads/1/3/1/6/131606006/40cf7ebe95f028f.pdf
    • http://honeybeestees.net/uploads/1/3/0/7/130775284/mirabape.pdf
    • http://vast-2.com/uploads/1/3/0/5/130543991/8fa3cb0.pdf
    • http://cridi.org/uploads/1/3/1/3/131384442/f4af7c6ee.pdf
    • http://shandsinstitute.org/uploads/1/3/0/4/130476389/21189cb1.pdf
    • http://grimsbyfishmanufacturing.com/uploads/1/3/0/7/130775760/9003204.pdf
    • http://mrmacbiblebook2.com/uploads/1/3/1/3/131382271/terms.html
    • http://mrmacbiblebook2.com/uploads/1/3/1/3/131382271/dmca.html
    • http://mrmacbiblebook2.com/uploads/1/3/1/3/131382271/policy.html
    • https://gabufiv745489397.files.wordpress.com/2020/06/fesoropivunufo.pdf
    • https://wutuximi750560644.files.wordpress.com/2020/06/zuralosevabax.pdf
    • https://tirafeb.files.wordpress.com/2020/06/42669694179.pdf
    • https://gojepideg.files.wordpress.com/2020/06/sedom.pdf
    • https://pitaxunus.files.wordpress.com/2020/06/11857602196.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_off0000646f.bin
cc30229f2cad81e98425295c0a0cd6e14b138cd1932ac8b5f6bebf09a20c6fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646F 10748 bytes

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