Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf318848b6fc966c…

MALICIOUS

PDF

40.5 KB Authoring application: Karbon
MD5: d3d411b38b67af7c5d03909ac8bda86a SHA-1: 6e91241265d515a11ef5885113d0a42b81690fe4 SHA-256: bf318848b6fc966cfd67b64ff61995b6322a4a42b10749cebebcb2e130b3f79a
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_LINK_FARM heuristic specifically identified a large number of embedded external links, with the primary suspicious URL being http://shiawati.ru/uploads/2020/01/27/7690106.pdf. This suggests the document's purpose is to redirect users to potentially harmful websites, likely for SEO spam or phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://shiawati.ru/uploads/2020/01/27/7690106.pdf
    • https://wugamivuv.weebly.com/uploads/1/3/0/4/130476104/pidelabuw.pdf
    • http://poulsborvspecials.com/uploads/1/3/0/4/130484005/05fadfc6a18.pdf
    • http://revivelifechurch.org/uploads/1/3/0/5/130589278/3868054.pdf
    • http://christianaraque.com/uploads/1/3/0/3/130323984/jexin_mipewumo_befubalajajoru.pdf
    • http://foilingkiteboard.com/uploads/1/3/0/6/130604968/karasokugometobo.pdf
    • http://lirategi.kazinoxxx.com/uploads/2020/01/29/e249e782ee.pdf
    • http://bof.nasdwkas.icu/uploads/2020/01/27/pefej.pdf
    • https://wapuravedowewef.weebly.com/uploads/1/3/0/6/130604947/melexupubiruga.pdf
    • http://uclaprisoned.org/uploads/1/3/0/2/130289179/zazed.pdf
    • http://anotherdayatthefeast.com/uploads/1/3/0/4/130435695/f4006a2911f0.pdf
    • http://wubabuti.manvs.ru/uploads/2020/01/29/17b4b002d0e546.pdf
    • http://medicinari-njemacka.com/uploads/1/3/0/6/130620305/9c3babbbb7e1ad6.pdf
    • http://macsmathclass.com/uploads/1/3/0/3/130324207/72878069.pdf
    • http://snobz.co/uploads/1/3/0/5/130589278/jijufowi.pdf
    • http://nemubarotu.xelamit.ru/uploads/2020/01/27/jubusajajesewa.pdf
    • http://myfloridaec.org/uploads/1/3/0/5/130547142/pufifol.pdf
    • https://busasebex.weebly.com/uploads/1/3/0/2/130271190/572d8abb.pdf
    • http://theporterauthority.com/uploads/1/3/0/4/130489082/zobazetufavigojoxe.pdf
    • http://agapa.net/uploads/1/3/0/6/130620274/vatepirobo-xabakizedus.pdf
    • http://kolesa26.ru/uploads/2020/01/28/7617027.pdf
    • http://amyjdesignsandillustrations.com/uploads/1/3/0/4/130490115/wesuxupuvewas_bufutavilivaj_tejatenuzuwiwo.pdf
    • http://formulaire.xyz/uploads/2020/01/28/mokagatefa_kufoti_rowazo.pdf
    • https://mibevofura.weebly.com/uploads/1/3/0/4/130494636/dbeee991f.pdf
    • http://rockyridgeacres.org/uploads/1/3/0/5/130539928/130539928.html#manuel+utilisation+batigest+i7

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001785.bin
5d7001806f1e3b711669b5e81a2ec57cc8cf3b3fda010fcec395dc5479b0b8a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1785 10068 bytes

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