Malicious PDF — malware analysis report

Static analysis result for SHA-256 81131b03bb5063f4…

MALICIOUS

PDF

76.5 KB Authoring application: Karbon First seen: 2020-09-24
MD5: 9d9234a5917f27aef4fbca2c08f79db5 SHA-1: f4ae3afaab9333e32b3a12008d811bc5b7d1bcf7 SHA-256: 81131b03bb5063f44524a67c3d2ff0cd82db8b0af5c3b31f1a5d4937cd79ae50
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs disguised as a medical document, a common tactic for SEO poisoning and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 3

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • 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://mydeckstairity.com/uploads/1/3/0/6/130604826/bugefiri-panukelofaw-xirelenilubug.pdf In PDF document text
    • http://blinddoghaven.net/uploads/1/3/0/6/130639781/36acc19b.pdfIn PDF document text
    • http://m.wchqfm.com/uploads/1/3/0/4/130488616/9119874.pdfIn PDF document text
    • http://somersetfoodtrail.org/uploads/1/3/0/7/130775786/130775786.html#guidelines+for+treatment+of+febrile+neutropeniaIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB 9000 bytes
SHA-256: 29e97a0cee3b6a250de528ab9367690db91bd2fe582c43ab977286d79f742e59
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 2696 bytes
SHA-256: b0a6a33381002d1c379ca931d660fe98df7a73518421c8b234b9dc16af60e95a

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