Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdee4a30276dafe…

MALICIOUS

PDF

31.3 KB Created: 2020-06-08 01:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f43b98e46685e37bd116bb5753c822d5 SHA-1: c0d41e048fc041ee691e26007acc1abae3f6a33c SHA-256: 0fdee4a30276dafe81a8efe74e28e2eb3d3d2cdec051c943109771fc6beaceb9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body text, though partially corrupted, includes a URL that appears to be a lure for educational material, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the extensive link farm and ML classification strongly suggest malicious intent.

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://ohio-dogbite.com/uploads/1/3/1/4/131455734/131455734.html#holt+chemistry+teacher+edition+pdf
    • http://aquarealm.com.sg/uploads/1/3/0/7/130776031/sedujav_tekiwaja.pdf
    • http://bodyaltar.com/uploads/1/3/0/6/130620265/1152756.pdf
    • http://charles-heiner.com/uploads/1/3/1/8/131857847/tegosasuxa.pdf
    • http://drewwieland.com/uploads/1/3/0/5/130545998/2043126.pdf
    • http://haralsoncountyrebelband.com/uploads/1/3/0/5/130588377/bifaxugobujasagilete.pdf
    • http://annaraj.org/uploads/1/3/0/3/130323437/mubesuku-vejixu-bogaxunuwe-kigolaliwun.pdf
    • http://spengaoa.com/uploads/1/3/0/3/130313700/bunepawapeki_raxezejuz.pdf
    • http://romhs.com/uploads/1/3/1/3/131381712/22fdb9e9.pdf
    • http://kashpoker.net/uploads/1/3/0/8/130874468/7619391.pdf
    • http://aacnationals2016.com/uploads/1/3/0/5/130551890/jomew_magebemulevelug_zoguratukuni_tokukemalek.pdf
    • http://ridetarga.co.uk/uploads/1/3/1/8/131871899/3523546.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zexekiko.files.wordpress.com/2020/06/80434470004.pdf
    • https://genofukefi.files.wordpress.com/2020/06/66285298788.pdf
    • https://gukebob.files.wordpress.com/2020/06/99977928854.pdf
    • https://xoxoxoram.files.wordpress.com/2020/06/59881133954.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_off00004e57.bin
85a2f492cfed55928cbfdd47a997911cfe93bbf8bb4d5eccb0daeae09f601605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E57 9884 bytes

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