Malicious PDF — malware analysis report

Static analysis result for SHA-256 db055c7aed7d930d…

MALICIOUS

PDF

44.1 KB Created: 2020-06-13 00:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec9da08749bfc6956bc4367731d9f512 SHA-1: e43430ed24bc0096e3b0a905893c7fcebde25738 SHA-256: db055c7aed7d930dad2a18c4fcbb40c669163949c08c753902cd05b5eb5bddc8
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, suggesting the document is designed to drive traffic to these external sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cancercure-fund.com/uploads/1/3/0/6/130603988/130603988.html#exerc%25C3%25ADcios+pr%25C3%25A9+hist%25C3%25B3ria
    • http://muonhunter.com/uploads/1/3/1/8/131872107/4813124.pdf
    • http://mta-sts.corvetteslimited.org/uploads/1/3/0/7/130739885/7103188.pdf
    • http://nashvilleaquaticsupplies.com/uploads/1/3/0/5/130590133/e50bcce3.pdf
    • http://youthcoalitionfl.org/uploads/1/3/0/7/130740623/xataba.pdf
    • http://liabletaxpreparation.com/uploads/1/3/1/6/131637755/be3c7c1.pdf
    • http://enviro-medics.com/uploads/1/3/0/4/130476743/zakanuludepajexi.pdf
    • http://houseofmusicpacks.com/uploads/1/3/0/6/130604731/2504197.pdf
    • http://mail.ronnybuechel.com/uploads/1/3/0/6/130604024/877948.pdf
    • http://jlinco.com/uploads/1/3/0/2/130292007/vubobibifuwodixud.pdf
    • http://getluckygolfcars.com/uploads/1/3/0/6/130621459/37ebbba87.pdf
    • http://draftbeersolutions.com/uploads/1/3/1/8/131871835/5830012.pdf
    • https://kinefubem794777150.files.wordpress.com/2020/06/5504403988.pdf
    • https://korovitezu.files.wordpress.com/2020/06/60315291563.pdf
    • https://vadobil.files.wordpress.com/2020/06/94624199699.pdf
    • https://gidikataso.files.wordpress.com/2020/06/wiritifewulufuvasovipato.pdf
    • https://vokalavejof.files.wordpress.com/2020/06/2858380088.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/
    • https://kinefubem794777150.files.wordpress.com/2020/06/550

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008104.bin
d21b386e57e0fb000a8b28592d2ed0168cf915ebfc3b12140c320523f85f5f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8104 11500 bytes

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