Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee7f7e7e0365fe8…

MALICIOUS

PDF

33.1 KB Created: 2020-06-02 06:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ae17a11f30b68b97a1b48f7fb5d69ff SHA-1: 1c8e118ae0f8462a783447c96b994ed2a94085ff SHA-256: 3ee7f7e7e0365fe8ad10f3ada66e44a43bcb1f2cbe9307fcfc2bd53b9775fd46
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files and HTML pages across multiple domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains some of these URLs, suggesting the primary purpose is to redirect users to these external resources. The exact nature of the content at the linked URLs is not determined, but the sheer volume and distribution across unrelated domains suggest a link farm or SEO poisoning attack, potentially leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jessbennettillustration.com/uploads/1/3/0/6/130621352/130621352.html#cmos+mixed+signal+circuit+design
    • http://blackcrownculture.com/uploads/1/3/1/1/131163920/zelibijubuzixob.pdf
    • http://ns4.gisu.org/uploads/1/3/0/6/130604884/9000481.pdf
    • http://susiegigg.com/uploads/1/3/1/4/131454986/4170580.pdf
    • http://empresselle.com/uploads/1/3/1/8/131856772/pigagiberu.pdf
    • http://give-duet.org/uploads/1/3/1/4/131453151/5601194.pdf
    • http://jessbennettillustration.com/uploads/1/3/0/6/130621352/terms.html
    • http://jessbennettillustration.com/uploads/1/3/0/6/130621352/dmca.html
    • http://jessbennettillustration.com/uploads/1/3/0/6/130621352/policy.html
    • https://wuxolobunoju.files.wordpress.com/2020/06/26480195376.pdf
    • https://sulupazof.files.wordpress.com/2020/05/18357366351.pdf
    • https://xilogip.files.wordpress.com/2020/05/68893499190.pdf
    • https://zidimamokad339045790.files.wordpress.com/2020/05/jomesowu.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_off00005686.bin
3d4dcb13de215cd90d7417768d3c139fb9770ee446f31d156cccb6741a53a440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5686 10180 bytes

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