Malicious PDF — malware analysis report

Static analysis result for SHA-256 c783773f8029ede7…

MALICIOUS

PDF

65.9 KB Created: 2020-04-01 20:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1be9ba348bbb395e074b0573805b0132 SHA-1: 2098c578db7f021beec645fd78401c390235e988 SHA-256: c783773f8029ede7ca8fc32debeadad3dda236976743520252c9111b2df0be21
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm, likely used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly supports the malicious nature of this document.

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://yourchairmansclub.us/uploads/1/3/0/5/130590019/130590019.html#habitos+de+estudio+en+estudiantes+universitarios
    • http://rivertownelectricllc.org/uploads/1/3/0/5/130588185/zazexulono.pdf
    • http://local9109.org/uploads/1/3/1/4/131437079/tiwajo_guxovofobodam_zurali.pdf
    • http://stfrancislawcenter.com/uploads/1/3/0/8/130814122/molot.pdf
    • http://teameffortnetwork-spray-vitamins.com/uploads/1/3/0/6/130604188/xiser.pdf
    • http://chirokate.com/uploads/1/3/1/4/131407629/zinavut-xirilominose.pdf
    • http://juliakiryanova.com/uploads/1/3/0/5/130588206/7bf57.pdf
    • http://cascadiagreens.us/uploads/1/3/0/6/130605143/dirijojapasupesuvuz.pdf
    • http://shinermotorsales.com/uploads/1/3/0/8/130873915/2812892.pdf
    • http://australianchartsreport.com/uploads/1/3/0/6/130604101/8498408.pdf
    • http://ravendale.org/uploads/1/3/1/3/131380594/nifobosejezav-luxetiwamuwi-wolujur.pdf
    • http://asientosyconversionessansebastian.com/uploads/1/3/0/6/130620362/3701436.pdf
    • http://beckervetclinic.com/uploads/1/3/0/2/130272291/1dd8d1.pdf
    • http://theobrook.com/uploads/1/3/1/1/131163872/3946102.pdf
    • http://marijuanabudmarketonline.com/uploads/1/3/0/5/130590464/4f23fee.pdf
    • http://balludicrous.com/uploads/1/3/0/7/130775382/ritufon.pdf
    • http://workingtowardzero.com/uploads/1/3/0/6/130621362/xozotazig_lewebexuwenuf_mudekilofekela_towuji.pdf
    • http://premiumcommercial.com/uploads/1/3/0/7/130775715/3cfbf8f4fa496.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_off0000d3d5.bin
aa49a94162b09ef782ad62552a25cce9af83561f34157dead329addb80d5811a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 10268 bytes

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