Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18834497b33d4d4…

MALICIOUS

PDF

46.6 KB Authoring application: PDFBox
MD5: f3674f9d9c473c2f4f0cf06a550ecf89 SHA-1: 2a3fe82ff58227c00f54174f90ef065a7e00166a SHA-256: b18834497b33d4d4ff746d46404e6320ee1a1c26f27752359e843a208204da3c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO spam or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack pattern is the mass linking to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://sex888.site/uploads/1/3/0/7/130776684/zaxag-fojipisizofola-farami-pafanariv.pdf
    • http://keyspirereviews.com/uploads/1/3/0/7/130740193/6333625.pdf
    • http://wearewnc.org/uploads/1/3/0/3/130323672/1723b85244d924.pdf
    • http://aboutpeople.net/uploads/1/3/0/5/130540197/301842.pdf
    • http://nuzzdos.com/uploads/1/3/0/5/130589044/mikomewor-difoworafusepot-wapudod.pdf
    • http://codeinecentralnew.com/uploads/1/3/0/6/130604595/xapano.pdf
    • http://www.headcounttracker.com/uploads/1/3/0/5/130550682/towoxipegenax-lijuvipezisef.pdf
    • http://nedsunderscorewood.org/uploads/1/3/0/5/130590702/roxivazip.pdf
    • http://www.patrickwphillips.com/uploads/1/3/0/7/130775983/047f94254.pdf
    • http://states.commonersmedia.com/uploads/1/3/0/4/130490875/5583101.pdf
    • http://colnevalleymarquees.com/uploads/1/3/0/4/130489926/widipiju-banejinu-timixifopewu.pdf
    • http://chsafaris.com/uploads/1/3/0/6/130639926/letixezizuwisixitu.pdf
    • http://www.na-x.com/uploads/1/3/0/5/130539074/ridutafo.pdf
    • http://www.ghostrockbooks.com/uploads/1/3/0/7/130776180/7119459.pdf
    • http://www.alphasigmaphinevada.org/uploads/1/3/0/8/130813837/bonajodagiw.pdf
    • http://jxkmanagement.com/uploads/1/3/0/2/130289799/7413339.pdf
    • http://74-123-78-123.mgwnet.com/uploads/1/3/0/3/130379114/130379114.html#female+endomorph+diet+and+workout+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a61.bin
fe0b9485ad716b1c547fc22b7d81778d027cf09d539134704e848c0ce88c6f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A61 8348 bytes

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