Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c393fe890f103d…

MALICIOUS

PDF

38.9 KB Authoring application: Solid Converter PDF
MD5: fd431286398028f4222ba5360b11e052 SHA-1: 3ab0737d2f2cd6dc975620d3830dc93670f98c14 SHA-256: 73c393fe890f103d2501ac4b7bcf72e81c966522c7b3ad6d8633debd0020b541
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO spam or to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are the primary IOCs, suggesting a phishing or content distribution attack.

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://ariana-johnson.com/uploads/1/3/0/6/130620505/pizupumeloj_jesageta_tuvudel_lamogidibojeti.pdf
    • http://nelsonkimeofficial.com/uploads/1/3/0/6/130605453/9971394.pdf
    • http://internationalparksideproductsinc.com/uploads/1/3/0/3/130323538/856458.pdf
    • http://discoveryelectricbikes.com/uploads/1/3/0/5/130550792/petige.pdf
    • http://newworldhousemedia.net/uploads/1/3/0/4/130435690/muwenoripisu-ritasufimu-povixa.pdf
    • http://adriantippetts.com/uploads/1/3/0/6/130621908/0b543.pdf
    • http://nupelicanparty.org/uploads/1/3/0/7/130739188/130739188.html#music+2019+migos

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000115a.bin
1c95c713c5d1b7be6ff033baaf275c936212ecc36a890d896b3ba376783722d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A 8412 bytes

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