Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdba598dada4a27d…

MALICIOUS

PDF

33.3 KB Authoring application: Smallpdf Desktop
MD5: ca61aa1832990362eeae685ec1b56781 SHA-1: cdf5315fa4ff2cdbc1687a389e180474db8b8b12 SHA-256: bdba598dada4a27dcd55ad833dddacadccc4e4ee280b5e5f6c29463f88d710d8
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical finding for a 'PDF_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. The document body contains numerous embedded URLs, with the primary one being http://jirusejixi.texdom64.ru/uploads/2020/01/28/6254593.pdf. This indicates a likely phishing or malware distribution attempt through a link farm strategy.

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://jirusejixi.texdom64.ru/uploads/2020/01/28/6254593.pdf
    • http://altstroy-vent.ru/uploads/2020/01/29/cb797ab.pdf
    • http://networkhearing.net/uploads/1/3/0/6/130604791/pewiwusamosixuni.pdf
    • http://activemech.com/uploads/1/3/0/6/130639021/4077265.pdf
    • http://mychinesewatch.com/uploads/1/3/0/6/130620852/130620852.html#faith+24.b%C3%B6l%C3%BCm+yeppudaa

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001155.bin
a967709170501e11026b616d7b949e6b10c64d6bd1fdf3871466965a189fb9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1155 9204 bytes
font_01_sfnt_off00003b88.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3B88 16036 bytes

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