Malicious PDF — malware analysis report

Static analysis result for SHA-256 965f8a4e6da7b915…

MALICIOUS

PDF

34.4 KB Created: 2020-06-04 05:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e5a380909464720c4764fd84a364f65 SHA-1: 93f9efee40607f155446ff3d802d014d532faae0 SHA-256: 965f8a4e6da7b9155d7cef0156b548fed2f379cb5adba0740c63202595de1ee7
94 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 as a PDF link farm, suggesting a malicious intent to manipulate search engine results or distribute further content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the extensive use of external URLs points towards a content distribution or SEO poisoning attack.

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://proocore.com/uploads/1/3/1/3/131379280/131379280.html#telangana+private+folk+songs+free
    • http://jessebooneactor.com/uploads/1/3/0/2/130289346/5711891.pdf
    • http://moonroadmarketing.com/uploads/1/3/0/3/130323092/08bb60.pdf
    • http://telatafoods.com/uploads/1/3/1/3/131379590/watexatotesuron_deretegowiw.pdf
    • http://ucs.3d.evans-supply.online/uploads/1/3/2/3/132302749/3489760.pdf
    • http://concentricoperationsgroup.com/uploads/1/3/0/4/130488223/8398943.pdf
    • http://orchardroadcanning.com/uploads/1/3/1/1/131163660/muxetedinirijox.pdf
    • http://klarathecow.com/uploads/1/3/0/2/130274154/5503391.pdf
    • http://sassyhopes.com/uploads/1/3/0/7/130776553/papomajesunizori.pdf
    • http://proocore.com/uploads/1/3/1/3/131379280/terms.html
    • http://proocore.com/uploads/1/3/1/3/131379280/dmca.html
    • http://proocore.com/uploads/1/3/1/3/131379280/policy.html
    • https://vujifemil.files.wordpress.com/2020/06/32192735924.pdf
    • https://sudivuv.files.wordpress.com/2020/06/tutarugedowakuwukosuvimep.pdf
    • https://legepuwob952756615.files.wordpress.com/2020/06/67795979436.pdf
    • https://torifom904409656.files.wordpress.com/2020/06/tajatutifus.pdf
    • https://borafitafule.files.wordpress.com/2020/06/73787615741.pdf
    • https://dogapexajok.files.wordpress.com/2020/06/tunajulora.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_off00005c08.bin
b09ad7759cf1696a666465c2f199fc7c570701b5b8f62623f88d49089774e01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C08 9916 bytes

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