Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdc998ddb2607c7…

MALICIOUS

PDF

36.6 KB Authoring application: Karbon
MD5: 7c58abc197eb73c227d5b6a9ac48cb12 SHA-1: e75f060b1288a2b5a378c939a246207dae2112d7 SHA-256: 8fdc998ddb2607c7d9cfa706d950cc81b7fe354860277bccb521c82a1459fe8c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic, which is a common tactic for distributing phishing or malware. The document body also explicitly contains many of these URLs. The heuristic SE_SECRET_RECOVERY_LURE indicates the document may also be attempting to trick users into revealing sensitive information. The ClamAV detection further confirms its malicious nature. The primary attack pattern involves directing users to external sites through a link farm.

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://koldenpianolessons.com/uploads/1/3/0/7/130776249/ce7ac60f2e780f.pdf
    • http://modularscience.net/uploads/1/3/0/6/130621464/5232183.pdf
    • http://pcrefurbisher.com/uploads/1/3/0/7/130775911/8308570.pdf
    • http://hospitalsonespases.info/uploads/1/3/0/5/130588921/daxegebixop.pdf
    • http://newmarkethanaiohana.com/uploads/1/3/0/3/130379681/xerapowuvozekilekixa.pdf
    • http://everettgroupconsulting.com/uploads/1/3/0/2/130288431/falevot.pdf
    • http://fabricoftheearth.com/uploads/1/3/0/4/130476076/5544870.pdf
    • http://novel-furniture.in/uploads/1/3/0/4/130476747/venobavezonaw.pdf
    • http://mihiomanus.com/uploads/1/3/0/8/130874379/fakipo_neganuzutipi.pdf
    • http://thesupporthelp247.com/uploads/1/3/0/2/130270777/lelamoma.pdf
    • http://whistleblowerrecovery.com/uploads/1/3/0/7/130740141/xuberenifowalewonot.pdf
    • http://extrahandsneeded.com/uploads/1/3/0/7/130776535/e0f75f84f0204d0.pdf
    • http://thecottonlickers.com/uploads/1/3/0/7/130775013/mutiguw.pdf
    • http://mymariavictoriawtx.com/uploads/1/3/0/7/130776279/naxewoxufu.pdf
    • http://adsl-63-204-18-35.benefitplans.org/uploads/1/3/0/6/130639059/130639059.html#how+to+remove+active+directory+certificate+services

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034b2.bin
365bbed34fe6664d9608affff5498122e6acfa9aca0fc60239ea70edcbfd9089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x34B2 8128 bytes

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