Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9c4037dd79106c…

MALICIOUS

PDF

113.3 KB Authoring application: LibreOffice
MD5: 1c670fd1e2041fc027bc06315117a4de SHA-1: 209ab1309dfa8779b429fd3310d7f615fc7071ac SHA-256: 4f9c4037dd79106c865744bf7f0a23ba73c69a32fb65706959d9eb8a2b1a2dfb
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to manipulate search engine results or distribute further content. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 further supports a phishing or traffic redirection motive. No scripts were extracted from this sample, but the extensive link farm is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://georgiacrook.co.uk/uploads/1/3/0/6/130621547/vemadimu.pdf
    • http://greenaviation.net/uploads/1/3/0/5/130589308/3206652.pdf
    • http://cureand.com/uploads/1/3/0/3/130379181/kugajobex-ditizafizutifix-rodikusatesu.pdf
    • http://victorvizslas.com/uploads/1/3/0/6/130604910/mufizifekosovavizo.pdf
    • http://bantunation.ca/uploads/1/3/0/7/130740025/6162127.pdf
    • http://thecottonlickers.com/uploads/1/3/0/2/130271201/kiwajujer_sijobiwevodi_feposa_zivamukuwaxo.pdf
    • http://zambiasafarihunting.com/uploads/1/3/0/7/130740444/130740444.html#anestesia+local+en+odontologia+macouzet

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001330.bin
418ac347bfd8a6017583886af5652090f48c15a503f9532d007700f2712250a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1330 11216 bytes

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