Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb52778b051ca76…

MALICIOUS

PDF

45.0 KB Created: 2020-04-01 23:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 65e76d9b3a7deef63e9201a9f77b04f0 SHA-1: a661e7f71c93b2ad6f28e1bf13db4891c43e9694 SHA-256: ccb52778b051ca764723df36cbb1aaa65f08ee786b5da5d515d6fdd75e0c46ca
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, characteristic of an SEO link farm. The primary URL, http://oakclass.com/uploads/1/3/1/4/131406977/131406977.html#xlstat+cr1c.dll+No+fundar, suggests a potential attempt to distribute malicious DLLs or redirect users to further malicious content. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates this malicious intent. No scripts were extracted from this sample.

Heuristics 3

  • 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
  • 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://oakclass.com/uploads/1/3/1/4/131406977/131406977.html#xlstat+cr1c.dll+No+fundar
    • http://paws4joy.net/uploads/1/3/0/4/130483167/2434998.pdf
    • http://ajarchinger.org/uploads/1/3/0/4/130477363/niwutoregipaki.pdf
    • http://designwise.org/uploads/1/3/0/8/130814132/1809661.pdf
    • http://soloptometry.com/uploads/1/3/0/7/130740178/6836078.pdf
    • http://villevilleporc.net/uploads/1/3/1/1/131163564/1a6d6c7.pdf
    • http://dubinmarketingstrategies.com/uploads/1/3/0/6/130604590/3853645.pdf
    • http://www.plummerpowermowershop.com/uploads/1/3/0/7/130776037/velubovab-mozon-jitidofozivev-zejegamoto.pdf
    • http://exoticwoodendesigns.net/uploads/1/3/0/4/130435757/5631787.pdf
    • http://orrerysystems.net/uploads/1/3/0/2/130287894/078af.pdf
    • http://backcareadvice.com/uploads/1/3/0/8/130813118/vidumakadiwijobewove.pdf
    • http://hollyshelpinghands.com/uploads/1/3/1/1/131164171/salajibezovudulotofo.pdf
    • http://lsat.expert/uploads/1/3/0/2/130274322/tupawopi.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000838e.bin
56de8db20b8ebe2b8608b37dcee57853fa2760c759a564ad49180bf7773ad8b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838E 10252 bytes

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