Malicious PDF — malware analysis report

Static analysis result for SHA-256 71940f8838ffa93e…

MALICIOUS

PDF

43.4 KB Authoring application: Smallpdf Desktop
MD5: ee46d074259b6ccc59650d35ab78927a SHA-1: 907c601897c04529358e8c1e5a5c7fb67336bf62 SHA-256: 71940f8838ffa93e040daa741c57af0b935d2f162ce7623889a8a5131b5f5391
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://cultofcardboard.com/uploads/1/3/0/2/130271161/xuxinudeserelalo.pdf
    • http://mixed-wrestling-london.com/uploads/1/3/0/6/130639766/birafefez.pdf
    • http://www.lettersfrominsanistan.net/uploads/1/3/0/5/130589245/daduzinibetatoxilu.pdf
    • http://nbc-heads-up-poker.com/uploads/1/3/0/6/130639409/6036367.pdf
    • http://thunderbirdsprings.com/uploads/1/3/0/6/130604694/453623ff1be0.pdf
    • http://evoluntario.com/uploads/1/3/0/2/130273584/numinefuzodenuvajota.pdf
    • http://kohlsvillefd.org/uploads/1/3/0/7/130738789/nokek_sewefobebof.pdf
    • http://americanexecutiveofficesuites.com/uploads/1/3/0/5/130588687/999c4e94.pdf
    • http://myfujingarts.com/uploads/1/3/0/7/130738722/vilemib-jisoxalaragoja-xatipi-jovuval.pdf
    • http://saddlemachine.com/uploads/1/3/0/7/130776252/8553756.pdf
    • http://fullcirclecycling.biz/uploads/1/3/0/5/130540146/sobopedanud.pdf
    • http://fleettrackandfield.com/uploads/1/3/0/3/130313470/baduje_xexir_bolilom_jinugolekijuvo.pdf
    • http://thecookiieeejar.com/uploads/1/3/0/4/130435734/wilipatupek.pdf
    • http://host13.pleasingfood.com/uploads/1/3/0/2/130274166/130274166.html#name+the+crystalline+allotropes+of+sulphur+that+is+stable+at+room+temperature
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000042ac.bin
bff1374cd5d68ec7fef1c56a6dcb4130062e8e687cbddba7a1f3180d6a99bb89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42AC 3284 bytes
font_01_sfnt_off0000508d.bin
0954f26729c08ce5b97036ba31408a471012074c5d217d4af0fc7b5c19c5a4c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x508D 7952 bytes

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