Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f258783cbdeb29e…

MALICIOUS

PDF

40.2 KB Authoring application: Smallpdf Desktop
MD5: 2d65bb8872db3e2c5324436dcbefb325 SHA-1: e6f39154cfbde93e062f063faeeb44d0dd241850 SHA-256: 9f258783cbdeb29e795acc2815b4fc8adb9f9cf5d45649d76e4b14940cfb82d0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score further indicate malicious intent. The document body, though heavily truncated, suggests a lure related to 'Comptia a pdf 220-902', likely to trick users into visiting the linked sites for malicious purposes.

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://tryshashby-rolls.com/uploads/1/3/0/4/130488544/c45564e9.pdf
    • http://foveomedia.org/uploads/1/3/0/6/130604158/5704370.pdf
    • http://kittoconsultancy.com/uploads/1/3/0/7/130775727/cd188a8462b58.pdf
    • http://www.honorableconstruction.com/uploads/1/3/0/8/130814579/bf47776b9.pdf
    • http://camerasandchocolatesphotography.com/uploads/1/3/0/6/130620646/badbb733002097.pdf
    • http://naturalcleaningservices4u.com/uploads/1/3/0/6/130605204/01a2d27450ec8.pdf
    • http://hawgholster.com/uploads/1/3/0/2/130288883/zadove.pdf
    • http://weedeaterridinglawnmower.net/uploads/1/3/0/7/130739250/6316748.pdf
    • http://iotecenergy.com/uploads/1/3/0/4/130476747/wekigavis.pdf
    • http://aaasecurityadt.com/uploads/1/3/0/4/130436272/wigokal.pdf
    • http://newdirectionintlmin.com/uploads/1/3/0/6/130603836/27cf047dcfbb.pdf
    • http://74-123-76-102.mgwnet.com/uploads/1/3/0/6/130605194/130605194.html#comptia+a++pdf+220-902

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d5f.bin
45c39c4315a5d00962143d4102937301eb2649728d6de39b959633cfc30365c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D5F 16144 bytes
font_01_sfnt_off00004520.bin
3d3ce3dc0d55fa135de1e7e8e4f3235ee19254ce14bd8411fa2dcb3bcfcf1f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4520 8200 bytes

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