Malicious PDF — malware analysis report

Static analysis result for SHA-256 87792ce0b3c2e60c…

MALICIOUS

PDF

40.5 KB Created: 2020-03-23 05:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 992941b605fa99b75233a2f9a7d392c0 SHA-1: 312be69dd74c5411ad25632cf96b93a4d5da49c3 SHA-256: 87792ce0b3c2e60c0829da83bd90d2d3d7c6870284396067a98cc3906315be7a
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise, likely leading to further stages of an attack or phishing content.

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://sweetestdreams.org/uploads/1/3/0/4/130488946/130488946.html#quais+os+tipos+de+classe+de+elementos+quimicos+existentes
    • http://stormikc.net/uploads/1/3/0/6/130620801/818c2b7.pdf
    • http://www.revvpay.com/uploads/1/3/0/2/130287506/milimixa.pdf
    • http://digthesounds.org/uploads/1/3/0/6/130604324/kasepibunifam_tewomifijoweli_jokopawa.pdf
    • http://cindywilson.org/uploads/1/3/0/7/130775722/bivirizedodexovo.pdf
    • http://joshuamatthewphillips.com/uploads/1/3/0/6/130639258/zapanatuk.pdf
    • http://servitusstudios.com/uploads/1/3/0/6/130639642/8784105.pdf
    • http://sweetwillowsoap.com/uploads/1/3/0/6/130622058/3477595.pdf
    • http://www.580washingtonstreet1503.com/uploads/1/3/0/5/130543107/aac104557d.pdf
    • http://hostmaster.imos-pizza.com/uploads/1/3/0/5/130589151/9585567.pdf
    • http://custombuildingconcepts.com/uploads/1/3/0/8/130873918/gokejixenu_milowugux_nebukunumeveke.pdf
    • http://pplansplus.com/uploads/1/3/0/4/130489168/9dc3a05c523.pdf
    • http://cgpservicesfinanciers.ca/uploads/1/3/1/1/131163949/2ab6abbfcec9113.pdf
    • http://goinluxuryprivatechauffeur.com/uploads/1/3/0/5/130590357/b1f5f90d94e6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006863.bin
90511a7920dcb2cf79aaf6a54f5ad377bc48fdbe184987962f567514f8a35de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6863 9724 bytes
font_01_sfnt_off00008875.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8875 2652 bytes

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