Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c46f8f249dfc68…

MALICIOUS

PDF

44.6 KB Created: 2020-04-02 08:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a357885c105de02eb1719d807cb58db3 SHA-1: 92aea3c19322f7974a563ef0a281782a7477e1cb SHA-256: 00c46f8f249dfc68975d14a15e1d08b157dda43f20e53d02c6317e348708bd98
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, likely serving as a means to redirect users to malicious content or for SEO manipulation.

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://ryanlabee.com/uploads/1/3/1/1/131163615/131163615.html#discrete+mathematics%28sets%29+inclusion+exclusion+principle+examples
    • http://deardrew318.com/uploads/1/3/0/7/130739883/xegewibivumob.pdf
    • http://finsethstockdogs.com/uploads/1/3/0/7/130775056/842b68.pdf
    • http://cadenadeconfianza.com/uploads/1/3/1/3/131382808/8432027.pdf
    • http://wehavethemeat.com/uploads/1/3/0/7/130775191/roxalopusabuka.pdf
    • http://gajonesconstruction.ca/uploads/1/3/1/0/131069789/96fcd8121.pdf
    • http://mosaicwellington.org/uploads/1/3/0/7/130776381/12d8eb2.pdf
    • http://northeastcarpentry.net/uploads/1/3/0/3/130313242/1747851.pdf
    • http://radiogirlcami.com/uploads/1/3/1/0/131070525/tukegivalosunorolo.pdf
    • http://jacenrivera.com/uploads/1/3/0/6/130621901/menobib.pdf
    • http://cooperagency.org/uploads/1/3/1/3/131398567/2223649.pdf
    • http://beachesinsrilanka.com/uploads/1/3/0/2/130291475/5069722.pdf
    • http://ypsitrucky.com/uploads/1/3/0/5/130543511/nogudakekerati.pdf
    • http://kalyncorstanje.com/uploads/1/3/0/6/130620730/tudowazasedos_vajufudixomup_saramomovuken_gataxiremaze.pdf
    • http://patriotcontainerhomes.com/uploads/1/3/0/4/130488696/6152540.pdf
    • http://jadealliance.org/uploads/1/3/0/4/130476200/3226186.pdf
    • http://alaskakarate.org/uploads/1/3/0/8/130874600/bapavaboleb_vufizi_jerer_mufarerak.pdf
    • http://mx.mx.cdsn.org/uploads/1/3/0/7/130738762/9948139.pdf
    • http://balancepilatesandmassage.com/uploads/1/3/0/7/130738835/7335181.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_off00006574.bin
61e67a9aa8bf808bb225b1434649436c9dcce5b183680107c6a397339cf775dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6574 7744 bytes
font_01_sfnt_off000083cb.bin
3064e7e5141c33e87cbf2e8383e01b93ba38cdfd91734008eaff4a270e81eba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CB 2700 bytes
font_02_sfnt_off00008d4f.bin
4b345a1f2c936c9e0af29d6d089a998b100df5ba34655c7a82af730291263bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4F 16316 bytes

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