Malicious PDF — malware analysis report

Static analysis result for SHA-256 f613d67f1028e143…

MALICIOUS

PDF

38.3 KB Created: 2020-03-28 01:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d002d491e80f1977ebc7e12046ae51d SHA-1: 5c5e02bce4b6921d6149a98bb130e8c7d48dd954 SHA-256: f613d67f1028e1430b41c226a3d0e4c74f3575adbfd3e2f7ce0e3bf11ee0e05e
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO poisoning tactic to distribute malicious content or redirect users to phishing sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://xilraazz.com/uploads/1/3/0/8/130874349/130874349.html#concepto+de+variable+independiente+fisica
    • http://nvlpr.com/uploads/1/3/0/2/130288307/26d1c.pdf
    • http://cranecrews.com/uploads/1/3/0/4/130475997/7740455.pdf
    • http://shingleshines.com/uploads/1/3/0/6/130604672/tegulidod_dagedarososuv_lerebofagav_jimolo.pdf
    • http://mugfordperformanceconsulting.com/uploads/1/3/0/6/130604392/fakejegid_ludikunobuwap.pdf
    • http://newyorkreadingsuccess.com/uploads/1/3/0/6/130605182/54d320.pdf
    • http://willjustchill.com/uploads/1/3/0/9/130969586/sireluw-lefetet-bapesalikakufu-kafezog.pdf
    • http://mta186.qualitynow.net/uploads/1/3/0/5/130540937/1258822.pdf
    • http://miketaylorgrading.com/uploads/1/3/0/6/130604641/3421048.pdf
    • http://adentanewzealand.com/uploads/1/3/0/2/130289649/kuzam_sugenadixugis_dabesolawe.pdf
    • http://www.bloomchildrensboutique.com/uploads/1/3/0/7/130739127/bokudonogal_zotexusizivotot.pdf
    • http://anindependentdelta.com/uploads/1/3/0/9/130969075/japesidanezapi_bizuvaneko.pdf
    • http://74-123-79-109.mgwnet.com/uploads/1/3/0/4/130435654/pibamiboduxe.pdf
    • http://cockfostersconsultation.com/uploads/1/3/0/5/130588616/luligamekep.pdf
    • http://themuddycupcoffeehouse.com/uploads/1/3/0/6/130639539/1362234.pdf
    • http://midd-lax.com/uploads/1/3/0/5/130538862/daf72c38d.pdf
    • http://drvtv.co/uploads/1/3/0/4/130483956/mefido.pdf
    • http://equippum.com/uploads/1/3/0/6/130621096/jisazuvodigizum.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_off00006bf4.bin
c836b6080999cd45aad318e4ea7ff5c88651a832c105280a3222b697cc456979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF4 8228 bytes

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