Malicious PDF — malware analysis report

Static analysis result for SHA-256 9879f5ebaf8f0756…

MALICIOUS

PDF

33.6 KB Created: 2020-04-19 00:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da73e90447c3153468fab7d9da929bab SHA-1: 83c26bacede10ff7eb7c3c064b6192a42a257f4e SHA-256: 9879f5ebaf8f07569f3344cd0eca6690b03f796b858edf2275b4bf249ab898a0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body text is largely unreadable due to encoding issues but contains a reference to the primary URL, suggesting a lure to external content. 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://aelmorris.com/uploads/1/3/1/0/131070692/131070692.html#more+hink+pinks+level+a+answers
    • http://waldohopfest.com/uploads/1/3/1/0/131070722/vepetew.pdf
    • http://whiteroseindustries.com/uploads/1/3/0/3/130379070/4090421.pdf
    • http://milagrosfineart.com/uploads/1/3/0/6/130603884/81444cee2fcd2.pdf
    • http://xn--croferretera-2fb.com/uploads/1/3/1/4/131482952/dogamevidupexowasob.pdf
    • http://thepinkpoppyboutique.com/uploads/1/3/0/6/130639998/689404.pdf
    • http://happycity.us/uploads/1/3/0/2/130288603/tetituxu-pirejor.pdf
    • http://academicbusinesscreative.com/uploads/1/3/0/8/130813539/daxenuwat-sojatejixir-fenodudis.pdf
    • http://taeinternal.com/uploads/1/3/0/7/130738537/82a6b1.pdf
    • http://gororealty.com/uploads/1/3/0/2/130291474/nejokadubi_xipuzufiwoge.pdf
    • http://daisybugdelivery.com/uploads/1/3/0/8/130874332/dasunak_javavaxedu.pdf
    • http://fbbcmadisonmembers.com/uploads/1/3/0/8/130874633/kazafanamugum.pdf
    • http://tailembendhotel.net/uploads/1/3/0/6/130639675/6118fa8967f04a.pdf
    • http://farmhousets.net/uploads/1/3/0/6/130604373/zajufidikoju-vuvubepafagovu-makemepuk.pdf
    • http://daisybugdelivery.com/uploads/1/3/0/8/130874332/dasunak_j
    • 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_off00005ac6.bin
17dd046a885cfe85393046d94de6c0d402af9b421913f331f9fbd39d8a18ae34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC6 8312 bytes

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