Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa848cbf9d4f14cc…

MALICIOUS

PDF

33.6 KB Created: 2020-06-03 10:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c653a062c12af92811defaf11d23002 SHA-1: b8eee66f2096952521718dd74464b01f9193a64a SHA-256: aa848cbf9d4f14cc3d5ac66aaf329013fbca086d55df04ccf2e48d25d2efe57f
62 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO link farms or to direct users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a potential attempt to drive traffic to a network of related sites. The document body, though partially corrupted, contains the phrase 'Silo de cemento' and references the wkhtmltopdf tool, suggesting a lure document designed to mask the malicious intent behind the numerous URLs.

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://mrsubmx.com/uploads/1/3/0/5/130590138/130590138.html#silo+de+cemento
    • http://mta175.qualitynow.net/uploads/1/3/0/5/130588821/b89ab9fea0068.pdf
    • http://trinitydistribution.net/uploads/1/3/1/1/131164097/5448096.pdf
    • http://noniecabrera.com/uploads/1/3/0/8/130814421/ba1955bd6a.pdf
    • http://reutterinvestments.com/uploads/1/3/1/1/131163550/8f984f900f.pdf
    • http://74-123-78-135.mgwnet.com/uploads/1/3/1/6/131607019/gilidekegugoge.pdf
    • http://greatlakesbaymentalhealth.org/uploads/1/3/1/3/131381963/7311125.pdf
    • http://mrsubmx.com/uploads/1/3/0/5/130590138/terms.html
    • http://mrsubmx.com/uploads/1/3/0/5/130590138/dmca.html
    • http://mrsubmx.com/uploads/1/3/0/5/130590138/policy.html
    • https://zapekijibu.files.wordpress.com/2020/05/42960205088.pdf
    • https://minoxavaxa.files.wordpress.com/2020/06/16540127896.pdf
    • https://jijepegiziw414753312.files.wordpress.com/2020/06/68020632912.pdf
    • https://kibegij.files.wordpress.com/2020/05/fozaridofuzuzax.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_off00005681.bin
0b0586ccf98b6a548800e5f32ba0330f234e8b73d294d280460b9da37b7804ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5681 10860 bytes

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