Malicious PDF — malware analysis report

Static analysis result for SHA-256 591b2daa6c4199ba…

MALICIOUS

PDF

44.1 KB Authoring application: Solid Converter PDF
MD5: 12851df2c92990c19e890ab87f829db8 SHA-1: 52f773838a2ad0f23cbb8185653da87510f6c57f SHA-256: 591b2daa6c4199bae5698ca1cb8744b1b9f02c72e2f12eae9b1ef99ed6c09379
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies the mass external PDF link farm as a critical finding.

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://toprestaurantreviews.com/uploads/1/3/0/7/130775395/povorewarabe.pdf
    • http://miamfoundation.org/uploads/1/3/0/5/130539691/0cda65a1170647.pdf
    • http://olivesandoil.net/uploads/1/3/0/5/130589354/vazagojoguzub-moxavavaw-tivone-ruvowowejug.pdf
    • http://mandalayoptique.com/uploads/1/3/0/2/130289663/zagidom.pdf
    • http://oneactioncalendar.org/uploads/1/3/0/5/130589400/pataxuketorib.pdf
    • http://varsitygreekstore.com/uploads/1/3/0/5/130589104/gunatidivof-rukom-zamusaxezofenuw-vubol.pdf
    • http://unityofstockton.com/uploads/1/3/0/4/130477490/3915784.pdf
    • http://theilovemebrand.com/uploads/1/3/0/4/130436093/gexugilu.pdf
    • http://russianair.com/uploads/1/3/0/6/130639740/mamuji.pdf
    • http://moodlabnewlife.nl/uploads/1/3/0/4/130488395/130488395.html#airbnb+guidebook+for+guests

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001256.bin
2ea787c0da0406f26b695c0c31bbcdf4be4540e4b9614bdc605d028de276b4b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1256 8524 bytes

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