Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d6e7bf38f7dcd9…

MALICIOUS

PDF

33.1 KB Created: 2020-06-09 06:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e48dede1794d3aec20e4d1068cbb6957 SHA-1: e5adfb888e44f4a70f5851b610a8546d761c4c76 SHA-256: 16d6e7bf38f7dcd9088d98d6c6cea309aa231f4e3eed11057ef5a76e5b2f1fa7
96 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, also contains URLs pointing to external resources. These links likely serve as a mechanism to redirect the user to malicious or spam content, potentially for SEO manipulation or further malware distribution.

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://general1948.com/uploads/1/3/1/3/131383383/131383383.html#videos+de+guidman+camposeco+mixels
    • http://osoculture.com/uploads/1/3/0/8/130813701/vanizetafejilikoles.pdf
    • http://train4safety.net/uploads/1/3/1/4/131452967/f01d719cd801c70.pdf
    • http://mta-sts.mail.headphonerepairhouse.com/uploads/1/3/0/8/130814980/631b25e4ea.pdf
    • http://rosamenta.com/uploads/1/3/1/6/131606854/a85800ebc187d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://duxofire.files.wordpress.com/2020/06/wimobavivat.pdf
    • https://sakadukil.files.wordpress.com/2020/06/3906873666.pdf
    • https://zuvekaxusuvi.files.wordpress.com/2020/06/8752152113.pdf
    • https://jipebowojor.files.wordpress.com/2020/06/tororixixonodo.pdf
    • https://tavatolu.files.wordpress.com/2020/06/tasoribediwamo.pdf
    • https://figiganep.files.wordpress.com/2020/06/wolinuzadiduxepekuxe.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000557d.bin
1d2257dc70d4612de7ebefc8dfe45b195b723cd3aa021f8d7576a94368591371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x557D 10576 bytes

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