Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc52e399593fe18…

MALICIOUS

PDF

50.0 KB Authoring application: Nitro PDF
MD5: edd3bd227c43100eadafa20e242481e2 SHA-1: c1dd30bd3a7c47a6b60d646a004975585f1b258c SHA-256: cfc52e399593fe188ff1ec0975411cb84d57847c3228127f4bf15475cde7a654
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 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 manipulation or to distribute further malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The document body, while containing some seemingly benign text about reading meters, also includes numerous URLs pointing to potentially malicious content.

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://daviduccio.ru/uploads/2020/01/28/7560686.pdf
    • http://ledseven.ru/uploads/2020/01/28/4389576.pdf
    • http://kavid.ca/uploads/1/3/0/5/130551554/4aa8b004cef292.pdf
    • http://myfureverfrenchie.com/uploads/1/3/0/6/130640097/bd97fed6adfb.pdf
    • https://nositexilodupaj.weebly.com/uploads/1/3/0/6/130604583/nowemuwafife.pdf
    • https://wajujaxomuna.weebly.com/uploads/1/3/0/2/130272296/womib.pdf
    • http://xozumut.ancientstudio.online/uploads/2020/01/28/4943348.pdf
    • http://mijnheerdegroot.nl/uploads/1/3/0/2/130289363/5624e35721.pdf
    • http://vuf.03shopppp.fun/uploads/2020/01/28/porudawajibezamosil.pdf
    • http://nicole-florio.com/uploads/1/3/0/6/130604806/8759393.pdf
    • http://guxewuma.drbash.tech/uploads/2020/01/29/nujuxojemijiwajamugo.pdf
    • http://thehnossaproject.com/uploads/1/3/0/2/130273581/130273581.html#reading+ammeters+and+voltmeters+worksheet

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012e2.bin
04f46a45061d3808c2f7b01f1ee432cfb0aceb236361f1ed89f0bb0ee3dbbe78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2 8516 bytes
font_01_sfnt_off0000732c.bin
669a22844ddb84b64a1d93eb6147c2b8b7ca76f4316fe4be2bbf69c96252e72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732C 16180 bytes
font_02_sfnt_off0000880b.bin
cfb3357b20fb01955c1e4a0ed568c791e3a97db8f0fbaa18432a833eaa1d19da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880B 2828 bytes

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