Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bac6bbbfd1bb04…

MALICIOUS

PDF

33.8 KB Created: 2020-03-19 12:32:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: af95e7a07ac4b7ebe4bb89c98f77b135 SHA-1: 8c0efdd8fb3d43cb213cdb72452b4bce10318f8d SHA-256: 57bac6bbbfd1bb0422f601356373a86d5fd74331464228ea7744aab5385c4c60
92 Risk Score

Malware Insights

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

The PDF document contains a lure related to document formatting, but its primary malicious function appears to be the embedding of a large number of external links. These links point to various PDF files hosted on numerous domains, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://shinnkelloggllc.com/uploads/1/3/0/7/130775251/130775251.html#como+dividir+el+texto+en+columnas+en+word+2010
    • http://theguesthouseonbayview.ca/uploads/1/3/0/6/130605341/retelezawomupubake.pdf
    • http://lijufabc.com/uploads/1/3/0/2/130270914/neborok-dojugi-buremu.pdf
    • http://informativegenetics.com/uploads/1/3/0/5/130540281/wirezaruto.pdf
    • http://xtrabliss.com/uploads/1/3/0/7/130776228/wonazipemi.pdf
    • http://www.b-luma.com/uploads/1/3/0/7/130776446/3791486.pdf
    • http://tbreezycentral.com/uploads/1/3/0/6/130604509/xejibidub_xegofebeb.pdf
    • http://andreadahljohnstonspeechpathology.com.au/uploads/1/3/0/4/130490928/1978866.pdf
    • http://edge.therapyprime.com/uploads/1/3/0/5/130589227/8881328.pdf
    • http://livewell-bioscience.com/uploads/1/3/0/6/130621601/mexadagokevolulup.pdf
    • http://tucsoncatalyst.org/uploads/1/3/0/6/130621900/nuguwuvamawatap.pdf
    • http://www.shapingtemples.com/uploads/1/3/0/2/130271094/ad63004a93.pdf
    • http://lyellis.com/uploads/1/3/0/6/130639552/b14379ff10b7266.pdf
    • http://www.chefspalletspicerub.com/uploads/1/3/0/2/130274305/koxitujo.pdf
    • http://shipbidder.com/uploads/1/3/0/2/130272619/f14085070d47.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_off00005bee.bin
a407aa5bbeb9101beefeb0ce97a599aa710e07aad36745d470d2d4414a681ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEE 7624 bytes

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