Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8dede1521c686d…

MALICIOUS

PDF

39.6 KB Created: 2020-04-09 03:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 81eb402b19d899883446f141b0144c3f SHA-1: 0e1c851ed0ad987c4b11b75f7d6bc4f274a63d3e SHA-256: 6d8dede1521c686d16809a896c9ba9c90a0fcfe5dd2dc023d1680c9db232a5da
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF link farm. The primary external URL found is http://dannysshoes.org/uploads/1/3/0/6/130621432/130621432.html#como+despejar+formulas+de+mruv. This activity suggests the document is part of a campaign to manipulate search engine rankings or redirect users to potentially malicious sites. No scripts were extracted, but the PDF structure and link farm heuristic strongly indicate 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://dannysshoes.org/uploads/1/3/0/6/130621432/130621432.html#como+despejar+formulas+de+mruv
    • http://mnguidedgoosehunting.com/uploads/1/3/0/7/130776750/pokowutedezisumare.pdf
    • http://yj-huang.com/uploads/1/3/0/7/130739597/b71f7871b1.pdf
    • http://rowlandmediacenter1.com/uploads/1/3/0/4/130489253/kiretoruki_junanakofik.pdf
    • http://lobelia.be/uploads/1/3/0/4/130488786/fedadoli.pdf
    • http://fernandgertrude.shop/uploads/1/3/0/4/130483736/6522062.pdf
    • http://julietstyles.com/uploads/1/3/0/8/130874308/xojojovaw.pdf
    • http://brooklynfete.com/uploads/1/3/0/6/130605149/7135232.pdf
    • http://gravurengraving.com/uploads/1/3/0/7/130740318/jizuzovovugime-xilosev-jikad.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_off00006462.bin
a1c8720e1286523f6a7d9bf7a3f9559c349518b5995cd39bbd60ca109954d8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6462 9892 bytes
font_01_sfnt_off0000860a.bin
4d9ec2aec8f1ca6bebe1b56492fd55a77bba3a6e98efb76508c1b835d4eb9912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860A 2860 bytes

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