Malicious PDF — malware analysis report

Static analysis result for SHA-256 396cd8b8828e4ea1…

MALICIOUS

PDF

37.1 KB Authoring application: Adobe PDF Library 9.0
MD5: 327e1ce8df4d1b1d7e4d1514ae4e0704 SHA-1: 5dd6a30c3bf0a6bf70dac282b1ab76613d8be701 SHA-256: 396cd8b8828e4ea11ef8d2662499093a70474859081ba991065278e7f0b26398
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique commonly used for SEO poisoning or phishing. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Aggregation relief form' and 'Adobe PDF Library', suggesting a lure to a fake form or document.

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://moonrisetours.com/uploads/1/3/0/5/130550830/zirubasiluwulo.pdf
    • http://wordme.co/uploads/1/3/0/5/130551765/a46aed56.pdf
    • http://vifuvu.rostelekomlk.xyz/uploads/2020/01/28/2924115.pdf
    • http://natureinnny.org/uploads/1/3/0/5/130550684/8878531.pdf
    • http://northernstarproperty.com/uploads/1/3/0/4/130488834/tafagekuwe.pdf
    • http://bol.telekom-internet.info/uploads/2020/01/29/ropebuvexexes.pdf
    • http://ourchildrensfund.com/uploads/1/3/0/7/130738874/birupiku.pdf
    • http://novelsf.com/uploads/1/3/0/2/130272240/170d12.pdf
    • http://bsa-sccc-pack301.com/uploads/1/3/0/6/130620804/130620804.html#aggregation+relief+form

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000115f.bin
dcf719b5fd497c10a19901589442272345144e466ddd59e2c56fa42899515c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F 8348 bytes

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