Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8e4c57f0c8c3ed…

MALICIOUS

PDF

34.6 KB Authoring application: Nitro PDF
MD5: 2711943a888b5500f3a78150755e7914 SHA-1: 892c9c8ddac46f8c97b9d1c66a26410153c35fcd SHA-256: 5b8e4c57f0c8c3ed8e286df8377b26b1d65b1390b9a2caf49d945bab6ae2a0b9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting a critical heuristic for a large number of external PDF links. The document body, though partially corrupted, contains text related to Excel formulas and embedded URLs that form a link farm. This suggests the primary purpose is to redirect users to a large number of external PDF files, likely for SEO manipulation or to serve as a distribution point for further malware.

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://cahabagrand.com/uploads/1/3/0/8/130813972/6482106.pdf
    • http://mysecretlagoon.com/uploads/1/3/0/5/130546759/4128c38b4f94c.pdf
    • http://accountingredflags.com/uploads/1/3/0/8/130874128/2325755.pdf
    • http://simplepr.biz/uploads/1/3/0/7/130738679/6523046.pdf
    • http://www.theeyephotos.com/uploads/1/3/0/6/130639862/5417779.pdf
    • http://theblackcloudoh.com/uploads/1/3/0/5/130541744/7d0da9c6bf00cb.pdf
    • http://yourdoorisfixed.com/uploads/1/3/0/4/130476432/522558.pdf
    • http://youandmeand.us/uploads/1/3/0/2/130288316/kufefus.pdf
    • http://sentientmind.org/uploads/1/3/0/4/130435857/9b76c72cb2fc.pdf
    • http://capitolcouturepr.com/uploads/1/3/0/5/130551943/2814015.pdf
    • http://garagedoorrepairsanmarino-ca.com/uploads/1/3/0/8/130814713/3128581.pdf
    • http://benyjuana.com/uploads/1/3/0/2/130288321/5149159.pdf
    • http://cecilyeiferle.com/uploads/1/3/0/5/130588922/wakogufapexane.pdf
    • http://clemsonumc.net/uploads/1/3/0/5/130590380/61c2ad7f.pdf
    • http://ekincengizkan.net/uploads/1/3/0/7/130739156/7173294.pdf
    • http://bbeboutiquellc.com/uploads/1/3/0/6/130621588/968f8c1a.pdf
    • http://rsghzb.salon225.com/uploads/1/3/0/2/130289284/130289284.html#how+to+use+hlookup+formula+in+excel+with+example

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b25.bin
1833eee4cd2585f35be2f45a4b7aa7b01708c111a0ebb3f1155ca61db0096997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B25 8080 bytes

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