Malicious PDF — malware analysis report

Static analysis result for SHA-256 679bbc6acd14b7eb…

MALICIOUS

PDF

42.3 KB Authoring application: Smallpdf Desktop
MD5: 2dd87dc4877b4edbb4a0a3ba1dd796d4 SHA-1: e353926a09f51dd646f9d0eb991cb4a435d6c8d7 SHA-256: 679bbc6acd14b7eb53373c654444ba5f9e56dc103dbb72d41e877fa8a26c5b44
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for recovery secrets, private keys, or backup codes, disguised as AWS cloud interview questions. It also features a large number of external PDF links, suggesting a link farm or redirection mechanism. No scripts were extracted, but the presence of embedded URLs and the nature of the lure indicate a phishing attempt.

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.
  • 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://hostmaster.katewesterlund.com/uploads/1/3/0/6/130640078/2461808.pdf
    • http://novellaproposals.com/uploads/1/3/0/5/130551086/628cbd5b87479b.pdf
    • http://natalieunisexandbarbershop.com/uploads/1/3/0/5/130589147/9a810df2625d39.pdf
    • http://shannaberube.com/uploads/1/3/0/5/130540402/9620150.pdf
    • http://liberty-rc.com/uploads/1/3/0/6/130621055/d9393731.pdf
    • http://yardsalessource.com/uploads/1/3/0/6/130620705/dakewiv_vetez_maxunevenaga_vepafizamagujiz.pdf
    • http://gablehorse.net/uploads/1/3/0/5/130542770/miwenesefenisom-suvipujazib-viliva-wodotef.pdf
    • http://vitaliswellness.com/uploads/1/3/0/7/130739301/patipevadugug_tujedezo_jubumaji.pdf
    • http://christmaspresentstore.net/uploads/1/3/0/6/130621847/berir.pdf
    • http://www.lemmer4villagetrustee.com/uploads/1/3/0/5/130551064/5045071.pdf
    • http://randallwakefield.com/uploads/1/3/0/2/130288318/6290746.pdf
    • http://procommlllp.com/uploads/1/3/0/5/130545784/a50770.pdf
    • http://downforacure.org/uploads/1/3/0/7/130738511/bujipikurus.pdf
    • http://www.polarityzug.ch/uploads/1/3/0/5/130546354/130546354.html#aws+cloud+interview+questions+and+answers+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035cf.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35CF 16204 bytes
font_01_sfnt_off00004d8c.bin
f24113c4848f6d478db3926d0257105353bb4d121814f60847fab40c8e8e9f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8C 7572 bytes

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