Malicious PDF — malware analysis report

Static analysis result for SHA-256 0912cb8a96cc35af…

MALICIOUS

PDF

37.8 KB Authoring application: Pdftk
MD5: e0aecac983f89fa09bcdf0a3e8c626fc SHA-1: 2b2983e4673112490d4316c04e02615f5ec19c76 SHA-256: 0912cb8a96cc35afdc467236506ff334d61470f5825e19a47649f8c77a53f379
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing indicating a link farm, with multiple external PDF URLs embedded. The ClamAV detection and ML classifier also flag this as malicious, specifically as phishing. While no scripts were directly extracted, the embedded URLs suggest a pattern of distributing or linking to potentially malicious content, possibly for SEO manipulation or to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://skycampgreenwich.org/uploads/1/3/0/4/130490808/e02db.pdf
    • http://rugbyspb.ru/uploads/2020/01/29/fabcb4b70f818b.pdf
    • http://migeorgeson.com/uploads/1/3/0/2/130270863/6e9fc94.pdf
    • http://cretanoliveoilfarm.gr/uploads/1/3/0/6/130604281/4732223314d.pdf
    • http://beyondhillco.com/uploads/1/3/0/5/130588546/130588546.html#brady+bunch+theme+song+sheet+music+free
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004674.bin
3792ea9cb7a638d95f6369ff25055bd88da1cb0dd38bb382c7511605befd11da		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4674 18164 bytes
font_00_sfnt_off0000102d.bin
5dccabb37941765a21600556b48b7589a163d86e4ad72e8c3bb4cce97be5df5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D 8140 bytes

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