Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dc9ae10e02911c…

MALICIOUS

PDF

50.1 KB Created: 2020-04-13 09:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 175de48f40d1b0860aa17bb03f192362 SHA-1: c77521c558227b3cef7cddbb891f693570affaef SHA-256: 74dc9ae10e02911caa9ac27f71f214fa3be15cbb4558293355917ca1d7084c6c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a heuristic firing for a link farm, indicating it hosts numerous external links to other PDFs. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains a URL that matches one of the extracted external links, suggesting the document's primary purpose is to redirect users to a network of potentially malicious or SEO-manipulated content.

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://victoriasaesthetics.net/uploads/1/3/1/6/131636562/131636562.html#funcion+del+bulbo+del+vestibulo
    • http://silverraincoaching.com/uploads/1/3/0/4/130435712/ddee7b068.pdf
    • http://jlcreativellc.com/uploads/1/3/0/9/130969983/zakatixiti.pdf
    • http://shiftfreedom.net/uploads/1/3/1/3/131398219/2298332.pdf
    • http://emavideo3d.com/uploads/1/3/0/5/130588779/kubipafejoso.pdf
    • http://movebox.nl/uploads/1/3/0/6/130622089/9691216.pdf
    • http://oxfordsecurityservices.org/uploads/1/3/0/4/130435909/kaledeketi_menimi_vojup.pdf
    • http://bassbrothersllc.com/uploads/1/3/0/8/130874530/9878571.pdf
    • http://hopeccidaho.org/uploads/1/3/0/7/130776504/xamakenasebije-tekosuvap-sexaxivuxikuxi-fewunupekap.pdf
    • http://mingyilighting.com/uploads/1/3/0/6/130640102/tuwudolejokuwir.pdf
    • http://emailforkids.org/uploads/1/3/1/4/131454121/lixunapekap_xivisaxoma.pdf
    • http://amfusion.com/uploads/1/3/1/3/131379395/katemeno_zojoboviduk_zoxutakasad.pdf
    • http://rubyandpaul.com/uploads/1/3/0/6/130620467/bopolaso.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000711d.bin
e3a9e11047269c7cf4a6fbb51afef18afbda0372a11e4498b45861fc2d1374b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711D 1700 bytes
font_01_sfnt_off00007934.bin
6e17ce6109df283256207d00904c5e759f3a15ccc22592d62a4598ba361b70bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7934 9972 bytes
font_02_sfnt_off00009b64.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B64 2652 bytes
font_03_sfnt_off0000a4cb.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CB 16036 bytes

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