Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a4f377eab6604f…

MALICIOUS

PDF

42.7 KB Created: 2020-04-07 22:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2e74545abaee845a69f48747a3afdde5 SHA-1: 687d8f3567cb752eeace07829fcf7121cb0ffe0b SHA-256: 35a4f377eab6604ffd5e18ea84d25aceb66b9c1c355d04b8daa403f78624212d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 User Execution

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of SEO spam or a link farm designed to redirect users to potentially malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the ability to determine a specific payload or further actions.

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://chichesterfootandankle.org/uploads/1/3/1/4/131452987/131452987.html#1985+atc+70+parts
    • http://fitnessdeliveredavl.com/uploads/1/3/0/4/130493037/kanufuwafibe-bisixat-jalamujetabep.pdf
    • http://jimmiehudsonstudio.com/uploads/1/3/1/3/131381720/90641d8137.pdf
    • http://the5statesofteamsuccess.com/uploads/1/3/0/2/130289270/pujexituwavovarolaj.pdf
    • http://arnore.com/uploads/1/3/1/0/131071256/warivaxigoror_luwavadawegeli_buduresijise.pdf
    • http://agapa.net/uploads/1/3/0/2/130292179/virapa.pdf
    • http://caregiversandrebels.com/uploads/1/3/1/4/131437089/zimegis-vaniduwizev.pdf
    • http://mta-sts.mail.tarawattdesign.com/uploads/1/3/0/9/130969294/lelupadamu.pdf
    • http://thefloridapanther.com/uploads/1/3/0/7/130739452/6914741.pdf
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000666d.bin
797317a60522c0d30aa28cc9e750f1f7a6add365d22b37268358f3587be58d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666D 8808 bytes
font_01_sfnt_off00008857.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8857 16036 bytes

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