Malicious PDF — malware analysis report

Static analysis result for SHA-256 1164d52a3eccda69…

MALICIOUS

PDF

80.2 KB Authoring application: LibreOffice
MD5: e2a492e1769c9df5bf8309cb37a6a087 SHA-1: 799614f3929d12bd186a0a0807cdf684d33ed46b SHA-256: 1164d52a3eccda691b9e08f00ce741fec03183a26421815cef11ca7c13fcd05a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The primary attack pattern observed is the PDF_SEO_LINK_FARM heuristic, which identified a large number of embedded URLs pointing to other PDF files hosted on various domains. These URLs are likely used to manipulate search engine results or distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://renewair.org/uploads/1/3/0/6/130604539/1054039.pdf
    • http://linnenn.lv/uploads/1/3/0/3/130323329/51491968b75.pdf
    • http://brandgrenade.com/uploads/1/3/0/7/130775197/9220497.pdf
    • http://toddgriner.com/uploads/1/3/0/7/130776646/cf41dee82ad3f.pdf
    • http://www.leap-alliance.com/uploads/1/3/0/5/130551222/b8563ac30d5.pdf
    • http://hostmaster.djsinthemix.net/uploads/1/3/0/6/130620607/dokeleb.pdf
    • http://photocardsbyjimmy.com/uploads/1/3/0/5/130550814/da5b7a34861.pdf
    • http://mooreinnovation.org/uploads/1/3/0/4/130488500/353bf06f5e.pdf
    • http://raycoffee.net/uploads/1/3/0/7/130740456/fudipajisimuv.pdf
    • http://netvisionaries.com/uploads/1/3/0/5/130551586/7945129.pdf
    • http://qpcym.slpny.com/uploads/1/3/0/4/130483512/130483512.html#ablls+r+materials+list
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cb4.bin
2eab7a17e5e659606e19764d98e449e81d98a3b011ff9c99e33ccf95db350703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB4 10256 bytes
font_01_sfnt_off0000f6db.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 16036 bytes

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