Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ae003cbbb7abbb…

MALICIOUS

PDF

40.6 KB Created: 2020-06-05 08:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0014337c0ea5e73da8191e9b02e3e47f SHA-1: 4aa9d11749097a16feaba2092ba0405a22ced8fb SHA-256: 19ae003cbbb7abbb4a9a7f3ab7e5dee88ac401638f206e06b26886fc98cf1cf1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged the document as malicious with high confidence. The embedded URLs suggest an attempt to redirect users to potentially malicious content or for SEO spamming purposes. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://yourchairmansclub.us/uploads/1/3/0/8/130874016/130874016.html#jam+origin+midi+guitar+crack
    • http://dynamic-ls.com/uploads/1/3/1/4/131453401/xokon.pdf
    • http://hostmaster.whawkins.uk/uploads/1/3/2/3/132302987/xufijobep_fonavenimu.pdf
    • http://acinomunited.com/uploads/1/3/1/8/131856887/jofozidanasete-gateruz.pdf
    • http://cubriendocfl.net/uploads/1/3/1/6/131606279/9674045.pdf
    • http://jacquiesbistro.com/uploads/1/3/0/6/130621836/fusonixeri.pdf
    • http://yourchairmansclub.us/uploads/1/3/0/8/130874016/terms.html
    • http://yourchairmansclub.us/uploads/1/3/0/8/130874016/dmca.html
    • http://yourchairmansclub.us/uploads/1/3/0/8/130874016/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://diwesazinig.files.wordpress.com/2020/06/54842934318.pdf
    • https://panoxovijudo.files.wordpress.com/2020/06/zetukifibupoledepelopog.pdf
    • https://kagopufep.files.wordpress.com/2020/06/mixafixawumumefodatikudon.pdf
    • https://lipopusopene.files.wordpress.com/2020/06/nujodufez.pdf
    • https://vipikewef.files.wordpress.com/2020/06/ravatuvetojoru.pdf
    • https://towawawoma.files.wordpress.com/2020/06/lidujawagu.pdf
    • https://feraponopegi.files.wordpress.com/2020/06/4422654248.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_off00007324.bin
a3a5f4cf01336b8625ef15dc5abd623f178ca0e387902e02c27bb844cc85e518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7324 10476 bytes

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