Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f6f261d9e5f9c4…

MALICIOUS

PDF

36.7 KB Created: 2020-05-16 05:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9e69a10dfc7fd16fef07a8b34e25976 SHA-1: 79ed252159d6dbc02a89ac2f35d3e91753da5dac SHA-256: 13f6f261d9e5f9c411fed64c89d9261fb01c8f8c62df04d4d134c6b6b3421213
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links pointing to other PDF files across numerous domains. This behavior is indicative of a link farm or a mechanism to distribute further malicious content or engage in SEO manipulation. No scripts were extracted, but the sheer volume of external links suggests a malicious intent to redirect the user to potentially harmful resources.

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://shalanda.net/uploads/1/3/0/9/130969997/130969997.html#mr+beams+light+manual
    • http://eventstaffboston.com/uploads/1/3/1/0/131070202/2086080.pdf
    • http://redbarncountrymall.com/uploads/1/3/0/7/130776176/jubalexa.pdf
    • http://redlandcap.com/uploads/1/3/1/6/131606697/naramulinilivumab.pdf
    • http://eflynnparenting.com/uploads/1/3/1/4/131483128/51cb794.pdf
    • http://folsombluesbaseball.com/uploads/1/3/0/5/130539231/1539202.pdf
    • http://themindfulchristian.net/uploads/1/3/0/6/130621060/pojamenonib.pdf
    • http://curvybridevt.com/uploads/1/3/0/7/130776254/ec7f230ad52.pdf
    • http://tanhut.net/uploads/1/3/0/2/130272880/xiragesaxukek.pdf
    • http://ssspinks.com/uploads/1/3/0/6/130621163/nofanupes.pdf
    • http://carataris7.com/uploads/1/3/0/6/130621194/b030eca.pdf
    • http://beenvapored.com/uploads/1/3/0/2/130289225/vuvujanovatovix_tijakijotuxebuv_xerelorob.pdf
    • http://lashupwithneka.net/uploads/1/3/0/5/130588296/6208117.pdf
    • http://eecph.org/uploads/1/3/0/6/130605490/judimubudatusiti.pdf
    • http://arbitech.space/uploads/1/3/0/6/130639956/3098816.pdf
    • http://iceboatmarine.com/uploads/1/3/1/3/131383772/pivikaxetovugoxib.pdf
    • http://bscsocks.com/uploads/1/3/0/9/130969079/7691097.pdf
    • http://lesliedwyer.net/uploads/1/3/1/4/131408397/rewosiwepix-mazojosasak-venum-fugoze.pdf
    • http://foodietee.com/uploads/1/3/0/9/130969795/5560f141f.pdf
    • http://asistersings.com/uploads/1/3/0/7/130775537/7132960.pdf
    • http://royaltalentmodelsenterprise.com/uploads/1/3/0/7/130776099/fofobomuliragerez.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064aa.bin
18488c96bd47336f19c8d7e8111942129bf2d463454d2f959f3899787e4ecf40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AA 10120 bytes

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