Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf782bb90309fbf5…

MALICIOUS

PDF

39.2 KB Authoring application: OpenOffice.org
MD5: 228092beefc89a0baa958db3f159fed3 SHA-1: 453fa4c702be702f4444d7b0fa087881d250fb19 SHA-256: bf782bb90309fbf5061077189d69cbaf458fed9c21e8ef51bdddd1c60614e36b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO spam or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary attack pattern involves directing users to a link farm of potentially malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://tabithasdesigns.org/uploads/1/3/0/3/130379204/783ac35c178ddef.pdf
    • http://lawebared.uborka-kvartir-v-moskve.pro/uploads/2020/01/28/girukez_sisadiwib.pdf
    • http://acifte.org/uploads/1/3/0/6/130603704/xifot.pdf
    • http://782elm.com/uploads/1/3/0/6/130639045/1241402.pdf
    • http://bakerlawga.com/uploads/1/3/0/6/130604394/ab44e2d27de.pdf
    • http://101moyka.ru/uploads/2020/01/28/gevizenugofug.pdf
    • http://dekastanje.nl/uploads/1/3/0/5/130543133/9befe3aef6c31.pdf
    • http://americanhazelnut.co/uploads/1/3/0/3/130379062/e46234ab48b33.pdf
    • http://kacigraceco.com/uploads/1/3/0/4/130483830/linefasezorajow.pdf
    • https://kagumolat.weebly.com/uploads/1/3/0/2/130289466/53967.pdf
    • http://bayareasofareviews.com/uploads/1/3/0/6/130640214/d07a058.pdf
    • http://nationalfootballcheerleadersalumni.org/uploads/1/3/0/6/130620840/130620840.html#executive+function+worksheets+for+adults

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001290.bin
4a1794414dedee31033ac0638a10bde68c156e7b5aff0a936cbc318a0d4fd8c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1290 7892 bytes

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