Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfb57656c7537f6…

MALICIOUS

PDF

45.4 KB Created: 2020-04-10 15:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7de13e58f2ec46868de1d6057fde26b7 SHA-1: 86a152d9c76f82222450749a8e131e868c1efe34 SHA-256: 6cfb57656c7537f6647dcb53aeaafd330dfb39a5085ab1299820110f97f187ce
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to manipulate search engine results or host malicious content. The document body, though heavily obfuscated, contains URLs that are also listed in the heuristics, reinforcing the link farm behavior. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ductcleaningdc.com/uploads/1/3/1/4/131406892/131406892.html#laestrygonians+in+the+odyssey
    • http://gypsysongdesign.com/uploads/1/3/1/3/131398177/5985777.pdf
    • http://comic-card-creation.com/uploads/1/3/0/8/130874349/1760674.pdf
    • http://getsomelipfromerin.com/uploads/1/3/1/4/131436991/4075560.pdf
    • http://thechilledcookie.com/uploads/1/3/1/4/131408546/00044bbe.pdf
    • http://kornscampgrounds.com/uploads/1/3/0/6/130604009/3affab0339df.pdf
    • http://susanwnuk.ca/uploads/1/3/0/6/130640020/d303596.pdf
    • http://showringbowtique.com/uploads/1/3/0/5/130545254/movulajagelobos.pdf
    • http://vegasfabric.com/uploads/1/3/0/6/130639929/914519d47c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006442.bin
b11eeed8be232e9f54d88f2d6ac12c9b80be12117df58d6937da4a220ed4e6dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 7788 bytes
font_01_sfnt_off000081f6.bin
dfd95f90dd1be5d9bfb0f6628f37721ceb8b202d6dd6200d40bd108186acf69c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F6 4812 bytes
font_02_sfnt_off00009248.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9248 16036 bytes

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